Move CONTRIBUTING.md to repo root.

CONTRIBUTING.md

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+# Contributing
+
+These are some notes about contributing.
+
+## Continuous Integration
+
+### Travis-CI
+
+* https://travis-ci.org/streetsidesoftware/cspell
+
+### Appveyor
+
+* https://ci.appveyor.com/project/streetsidesoftware/cspell
+
+### Code Coverage
+
+* https://coveralls.io/github/streetsidesoftware/cspell
+
+### NPM
+
+* https://www.npmjs.com/package/cspell
+* https://www.npmjs.com/package/cspell-lib
+* https://www.npmjs.com/package/cspell-trie
+* https://www.npmjs.com/package/cspell-tools
+* https://www.npmjs.com/package/cspell-glob
+
+## Development
+
+Node JS version 8 or higher is required.
+
+### Commands
+
+| Command | Description |
+| ------- | ----------- |
+| `npm install` | Installs all the dependencies for all packages |
+| `npm run build` | To compile the typescript into javascript |
+| `npm test` | Runs the unit tests for all packages |
+| `npm run check-spelling` | Checks the spelling for all sources files |
+| `npm run coverage` | Generates coverage information for all projects. Open `coverage/index.html` to view coverage. |
+| `npx lerna publish` | To publish the packages (must have permissions) |