add readme

Author: nishantwrp

README.md

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+
+<p align="center">
+    <a href="https://www.npmjs.com/package/gridsome-plugin-pwa">
+      <img src="https://gridsome.org/logos/logo-circle-light.svg" alt="gridsome logo" width="100px"/>
+    </a>
+    <h1 align="center">gridsome-plugin-hasnode-devblog</h1>
+    <p align="center">
+     Gridsome plugin to retrieve blog posts from your <a href = "https://hashnode.com/devblog">devblog</a> on <a href = "https://hashnode.com/">hashnode</a>. </p>
+    <p align="center"><a href="https://npmjs.com/package/gridsome-source-hashnode-devblog"><img src="https://badge.fury.io/js/gridsome-source-hashnode-devblog.svg" alt="npm version"></a><img alt="npm" src="https://img.shields.io/npm/dt/gridsome-source-hashnode-devblog"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square"><img src="https://badgen.net/github/license/nishantwrp/gridsome-source-hashnode-devblog"><img src="https://img.shields.io/david/nishantwrp/gridsome-source-hashnode-devblog"></p>
+</p>
+
+## Installation
+
+```
+# For npm
+$ npm install gridsome-source-hashnode-devblog
+# For yarn
+$ yarn add gridsome-source-hashnode-devblog
+```
+
+## Usage
+
+Add `gridsome-source-hashnode-devblog` to plugin array with following configurable options to `gridsome.config.js`
+
+```js
+module.exports = {
+  plugins: [
+    {
+      use:  'gridsome-source-hashnode-devblog',
+      options: {
+        username:  '', // Your username on hashnode
+        typeName:  'HashnodeDevblog' // Optional
+      }
+    }
+  ]
+}
+```
+
+## Example Query
+```
+query {
+  allHashnodeDevblog {
+    edges {
+      node {
+        title
+        slug
+        type
+        dateAdded
+        contentMarkdown
+        content
+        brief
+        coverImage
+        tags {
+          name
+        }
+        dateUpdated
+      }
+    }
+  }
+}
+```
+
+## License (MIT)
+
+Open [LICENSE](./LICENSE) file for more info