Issue #3321374 by Matroskeen: Replace README.txt with README.md

INTRODUCTON

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## Introduction

The Allowed Options module provides the ability to select allowed options for

list_* field types in "Manage form display" settings, hence it allows sharing

  `list_*` field types in "Manage form display" settings, hence it allows sharing

  the same field storage across multiple bundles but with different options.

Currently it supports the following field types:

 - List (float);

 - List (integer);

 - List (string).

 - List (string);

 * For a full description of the module, visit the project page:

For a full description of the module, visit the project page:

   https://www.drupal.org/project/allowed_options

 * To submit bug reports and feature suggestions, or track changes:

To submit bug reports and feature suggestions, or track changes:

   https://www.drupal.org/project/issues/allowed_options

REQUIREMENTS

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## Requirements

This module requires no modules outside of Drupal core. It is compatible with

  Drupal 8 and Drupal 9 versions.

INSTALLATION

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## Installation

Install as you would normally install a contributed Drupal module. Visit

  https://www.drupal.org/node/1897420 for further information.

CONFIGURATION

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## Configuration

 * Go to "Manage form display" page of the bundle;

 * Open widget settings of one of the list_* fields;

 * Open widget settings of one of the `list_*` fields;

 * Select allowed options and save your changes.

## Maintainers

- Ivan Doroshenko (Matroskeen) - https://www.drupal.org/u/matroskeen