Mov: Contributing guide

.github/CONTRIBUTING.md

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+# Contributing Guide
+
+## Development Setup
+
+[Node.js](https://nodejs.org/en/) is needed for the development of eruda.
+
+After cloning the repo, run:
+
+```bash
+# install npm dependencies.
+npm install
+# copy jasmine lib from node_modules to test folder.
+npm run setup
+```
+
+## Commonly used NPM scripts
+
+```bash
+# watch and auto re-build.
+npm run dev
+# build eruda.js and eruda.min.js
+npm run build
+# lint, build and test.
+npm run ci
+# check test coverage.
+npm run cov
+```
+
+## Project Structure
+
+- **doc**: documents.
+- **eustia**: eustia extended utilties.
+- **script**: webpack configuration, and some other useful scripts.
+- **src**: source code, written in es2015.
+- **test**: contain pages for testing.