Resolve #3368886 "Replace readme.txt to"

Closes #3368886

README.md

+# Deploy key Module
+
+Makes it possible to generate private/public keys for any entity.
+For example, if you want to generate a key pair and display the public key information per project node. Or per user.
+
+This is what powers the ssh keys part of Violinist.io
+
+## Table of contents
+
+- Requirements
+- Installation
+- Configuration
+- Maintainer
+
+
+## Requirements
+
+No additional modules or libraries are required.
+
+
+## Installation
+
+1. Install the User Instance module as you would normally install a contributed Drupal module. 
+2. Visit https://www.drupal.org/node/1897420 for further information.
+
+
+## Configuration
+
+Go to /deploy-key/regenerate/{entity_type}/{id} for regenerate the key.
+
+
+## Maintainer
+
+- Eirik Morland - [eiriksm](https://www.drupal.org/u/eiriksm)