Add copied readme

Author: jcs090218

README.md

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+[![Build Status](https://travis-ci.com/emacs-grammarly/auth-source-keytar.svg?branch=master)](https://travis-ci.com/emacs-grammarly/auth-source-keytar)
+[![CELPA](https://celpa.conao3.com/packages/auth-source-keytar-badge.svg)](https://celpa.conao3.com/#/auth-source-keytar)
+[![License: GPL v3](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+
+# auth-source-keytar
+
+Emacs Lisp interface for [node-keytar](https://www.npmjs.com/package/keytar)
+using [@emacs-grammarly/keytar-cli](https://github.com/emacs-grammarly/keytar-cli).
+
+## Installation
+
+You will need [@emacs-grammarly/keytar-cli](https://github.com/emacs-grammarly/keytar-cli)
+before using this library.
+
+```bash
+npm install -g @emacs-grammarly/keytar-cli
+```
+
+or after you have installed `auth-source-keytar.el` in your `load-path`. Do the following,
+
+```el
+(require 'auth-source-keytar)
+(auth-source-keytar-install)
+```
+
+## Usage
+
+List of supported API ported from [node-keytar](https://www.npmjs.com/package/keytar).
+
+* `auth-source-keytar-get-password`
+* `auth-source-keytar-set-password`
+* `auth-source-keytar-delete-password`
+* `auth-source-keytar-find-credentials`
+* `auth-source-keytar-find-password`
+
+*P.S. Checkout the [node-keytar#docs](https://github.com/atom/node-keytar#docs) for details*
+
+## Examples
+
+A small example to use this library in Emacs Lisp.
+
+```el
+(auth-source-keytar-set-password "service1" "testuser" "hello")  ; t
+(auth-source-keytar-find-credentials "service1")                 ; [ { account: 'testuser', password: 'hello' } ]
+(auth-source-keytar-find-password "service1")                    ; hello
+```
+
+If you attempt to use `auth-source` then,
+
+```el
+(auth-source-keytar-enable)
+(auth-source-keytar-search :service "service1" :account "testuser")
+```
+
+## Contribution
+
+If you would like to contribute to this project, you may either
+clone and make pull requests to this repository. Or you can
+clone the project and establish your own branch of this tool.
+Any methods are welcome!