Issue #3494305 by koustav_mondal, anybody: Update README.md using the Drupal template

README.md

-Custom Tokens
+# Custom Tokens
 ----------------------
 
 Custom Tokens gives the user the ability to create custom tokens for specific
 replacements that can improve other modules relying on
 <a href="http://drupal.org/project/token">Token</a>.
 
-Installation:
 
-1. Use Composer or download Custom Tokens and Token modules.
+## Table of contents
 
-2. Enable Custom Tokens and Token modules.
+- Requirements
+- Installation
+- Configuration
+
+
+## Requirements
+
+Drupal core modules
+
+- Filter
+- Text
+
+Outside Drupal core modules
 
+- Token
+
+
+## Installation:
+
+1. Use Composer or download Custom Tokens and Token modules.
+2. Enable Custom Tokens and Token modules.
 3. Assign permissions "administer custom tokens" and "administer custom token 
    types" to any role you would like to be able to manage custom tokens 
    or types.
 
-To create tokens:
--
 
-1. Go to "Administer" -> "Structure" -> "Custom tokens".
+## Configuration
+
+- **To create tokens:**
 
-To create token types:
--
+   - Go to "Administer" -> "Structure" -> "Custom tokens".
 
-1. Go to "Administer" -> "Structure" -> "Custom tokens".
+- **To create token types:**
 
-2. Click on Custom Token Types tab.
+   - Go to "Administer" -> "Structure" -> "Custom tokens".
+   - Click on Custom Token Types tab.