build docs using markdown

Author: Bhupesh-V

docs/Makefile

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+## About coderunner

docs/about.md

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+# CodeRunner 🏃
+
+> [Judge0 API](https://api.judge0.com/) Interface written in Python
+
+[![Build Status](https://travis-ci.org/codeclassroom/CodeRunner.svg?branch=master)](https://travis-ci.org/codeclassroom/CodeRunner)
+![PyPI](https://img.shields.io/pypi/v/coderunner?color=blue)
+[![Documentation Status](https://readthedocs.org/projects/coderunner/badge/?version=latest)](https://coderunner.readthedocs.io/en/latest/?badge=latest)
+[![GitHub license](https://img.shields.io/github/license/codeclassroom/CodeRunner)](https://github.com/codeclassroom/CodeRunner/blob/master/LICENSE)
+[![GitHub issues](https://img.shields.io/github/issues/codeclassroom/CodeRunner?color=blueviolet)](https://github.com/codeclassroom/CodeRunner/issues)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-orange.svg)](http://makeapullrequest.com)

docs/conf.py

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+## Usage

docs/index.md

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+site_name: CodeRunner
+repo_url: https://github.com/codeclassroom/CodeRunner
+site_author: Bhupesh Varshney
+site_description: CodeRunner v0.3 Documentation
+copyright: © 2019, Bhupesh Varshney
+nav:
+    - Home: index.md
+    - Installation: installation.md
+    - Usage: usage.md
+    - About: about.md
+theme: readthedocs
+markdown_extensions:
+    - toc:
+        permalink: "#"