add readme

Author: nishantwrp

README.md

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+
+
+<p align="center">
+    <a href="https://www.npmjs.com/package/gatsby-source-hashnode-devblog">
+      <img src="https://elasticbeanstalk-ap-southeast-1-805366489044.s3.amazonaws.com/images/uploads/2019/03/30/gatsby_3lGK7jo.gif" alt="gridsome logo" width="500"/>
+    </a>
+    <h1 align="center">gatsby-source-hashnode-devblog</h1>
+    <p align="center">
+     Gatsby 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/gatsby-source-hashnode-devblog"><img src="https://badge.fury.io/js/gatsby-source-hashnode-devblog.svg" alt="npm version"></a><img alt="npm" src="https://img.shields.io/npm/dt/gatsby-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/gatsby-source-hashnode-devblog"><img src="https://img.shields.io/david/nishantwrp/gatsby-source-hashnode-devblog"></p>
+</p>
+
+## Installation
+
+```
+# For npm
+$ npm install gatsby-source-hashnode-devblog
+# For yarn
+$ yarn add gatsby-source-hashnode-devblog
+```
+
+## Usage
+
+Add `gatsby-source-hashnode-devblog` to plugin array with following configurable options to `gatsby-config.js`
+
+```js
+module.exports = {
+  plugins: [
+    {
+      resolve:  'gatsby-source-hashnode-devblog',
+      options: {
+        username:  '', // Your username on hashnode
+      }
+    }
+  ]
+}
+```
+
+## Example Query
+
+```graphql
+query MyQuery {
+  allDevblogPost {
+    edges {
+      node {
+        post {
+          brief
+          content
+          contentMarkdown
+          coverImage
+          cuid
+          dateAdded
+          dateUpdated
+          slug
+          title
+          type
+          tags {
+            name
+          }
+        }
+        id
+      }
+    }
+  }
+}
+```
+
+## License (MIT)
+
+Open [LICENSE](./LICENSE) file for more info