Issue #3338229: Update README.md file according to "README.md template"

README.md

-CONTENTS OF THIS FILE
----------------------
-
- * Introduction
- * Requirements
- * Installation
- * Configuration
- * Views exposed filters
- * Maintainers
-
-
-INTRODUCTION
-------------
+# Single DateTimePicker
 
 The Single Date Time Picker module supports date/time and date fields. You can
 use it on Datetime and Datetime Range fields.
 
 Features:
 
- * Support Datetime and Datetime Range field types
- * Support for Views exposed filters
- * 12/24 hour format display
- * Option to choose granularity for minutes
- * Option to disable specific days global (etc. Saturday)
- * Option to disable specific dates, useful for holidays, working days, etc.
+- Support Datetime and Datetime Range field types
+- Support for Views exposed filters
+- 12/24 hour format display
+- Option to choose granularity for minutes
+- Option to disable specific days global (etc. Saturday)
+- Option to disable specific dates, useful for holidays, working days, etc.
+
+For a full description of the module, visit the
+[project page](https://www.drupal.org/project/single_datetime).
+
+Submit bug reports and feature suggestions, or track changes in the
+[issue queue](https://www.drupal.org/project/issues/single_datetime).
 
- * For a full description of the module visit:
-   https://www.drupal.org/project/single_datetime
 
- * To submit bug reports and feature suggestions, or to track changes visit:
-   https://www.drupal.org/project/issues/single_datetime
+## Table of contents
 
+- Requirements
+- Installation
+- Configuration
+- Views exposed filters
 
-REQUIREMENTS
-------------
+
+## Requirements
 
 This module requires the following outside of Drupal core:
 
- * Plugin Date and Time Picker library - https://github.com/xdan/datetimepicker
+- [Plugin Date and Time Picker library](https://github.com/xdan/datetimepicker)
 
 
-INSTALLATION
-------------
+## Installation
 
- * Install the Single Date Time Picker module as you would normally install a
-   contributed Drupal module. Visit https://www.drupal.org/node/1897420 for
-   further information.
- * Install external library from xdan trough composer or manual. Library
-   should be available at example.com/libraries/jquery-datetimepicker
+- Install as you would normally install a contributed Drupal module. For further
+  information, see
+  [Installing Drupal Modules]
+  (https://www.drupal.org/docs/extending-drupal/installing-drupal-modules).
+- Install external library from xdan trough composer or manual. Library
+  should be available at example.com/libraries/jquery-datetimepicker
 
     1. Manual download.
 
-       Download https://github.com/xdan/datetimepicker/archive/2.5.20.zip,
+       Download `https://github.com/xdan/datetimepicker/archive/2.5.20.zip`,
        and extract inside [webroot]/libraries/jquery-datetimepicker
 
     2. Using drupal-libraries-installer plugin.
@@ -87,30 +82,29 @@ INSTALLATION
        composer require "npm-asset/jquery-datetimepicker":"^2.5"
        ```
 
-    [Ensure composer packages of type drupal-library (options 2 and 3) or
-    npm-asset (option 4) are configured to install to the appropriate path.
-    ](https://www.drupal.org/docs/develop/using-composer/using-composer-to-install-drupal-and-manage-dependencies#third-party-libraries)
+[Ensure composer packages of type drupal-library (options 2 and 3) or
+npm-asset (option 4) are configured to install to the appropriate path.
+](https://www.drupal.org/docs/develop/using-composeusing-composer-to-install-drupal-and-manage-dependencies#third-party-libraries)
+
 
-CONFIGURATION
--------------
+## Configuration
 
-    1. Navigate to Administration > Extend and enable the module.
-    2. Navigate to Administration > Structure > Content types > [Content type
-       with date field] > Manage form display.
-    3. Select the date field to edit and choose "Single Date Time Picker" from
-       Widget drop down.
-    4. Edit the Field Plugin Setting by selecting the gear icon.
-    5. Select the hours format: 12 hours or 24 hours.
-    6. Select granularity for minutes in calendar: 5, 10, 15, 30, or 60 minutes.
-    7. Select days which are to be disabled in calendar.
-    8. To disable specific dates from calendar enter days in following format
-       d.m.Y etc. 31.12.2018. Each date in new line. This is used for specific
-       dates.
-    9. Update and Save.
+1. Navigate to Administration > Extend and enable the module.
+2. Navigate to Administration > Structure > Content types > [Content type
+   with date field] > Manage form display.
+3. Select the date field to edit and choose "Single Date Time Picker" from
+   Widget drop down.
+4. Edit the Field Plugin Setting by selecting the gear icon.
+5. Select the hours format: 12 hours or 24 hours.
+6. Select granularity for minutes in calendar: 5, 10, 15, 30, or 60 minutes.
+7. Select days which are to be disabled in calendar.
+8. To disable specific dates from calendar enter days in following format
+   d.m.Y etc. 31.12.2018. Each date in new line. This is used for specific
+   dates.
+9. Update and Save.
 
 
-VIEWS EXPOSED FILTERS
--------------
+## Views exposed filters
 
 This module contains submodule `single_datetime_exposed`.
 If you enable it, all exposed filters of types `date` and `search_api_date` will
@@ -120,8 +114,7 @@ It works with all operators, and none configuration is needed.
 If you need customized configuration, suggesting that you create your
 implementation based on this submodule.
 
-FORM API USAGE
--------------
+**Form api usage**
 You can use SingleDateTime in other parts of the Drupal FORM API with minor
 adjustments. If you are using non single_datetime elements, as textfield field
 type, you need to attach proper attributes on the field, and attach JS library
@@ -133,8 +126,6 @@ single_datetime directly.
 Also exist helper `\Drupal\single_datetime\AttributeHelper` with some default
 attributes options and examples. See examples below.
 
-
-
 **Custom single_datetime field**
 Using AttributeHelper you can create default widget:
 
@@ -149,7 +140,6 @@ $form['purchase_date'] = [
 ] + \Drupal\single_datetime\AttributeHelper::allElementAttributes();
  ```
 
-
 Directly using your attributes.
 ```
  $form['purchase_date'] = [
@@ -189,7 +179,6 @@ Using AttributeHelper you can create default widget:
  $form['#attributes']['autocomplete'] = 'off';
  ```
 
-
 Directly using your attributes.
 ```// Using datetimepicker module.
  $form['purchase_date'] = [
@@ -211,14 +200,3 @@ Directly using your attributes.
  $form['#attached']['library'][] = 'single_datetime/datetimepicker';
  $form['#attributes']['autocomplete'] = 'off';
  ```
-
-
-
-MAINTAINERS
------------
-
- * Valentino Međimorec (valic) - https://www.drupal.org/u/valic
-
-Supporting organization:
-
- * Vallic - https://www.drupal.org/vallic