style(CONTRIBUTING.md): start contributing guidelines for ngHint

Closes #19

Author: Erin Altenhof-Long

CONTRIBUTING.md

@@ -0,0 +1,42 @@
+Contributing Guidelines
+-----------------------
+
+Angular-Hint is designed to be a modular tool. This way, independent Angular-Hint modules can be developed as standalone projects and later included in the overall Angular-Hint collection. We hope this will encourage you to develop your own Angular-Hint modules.
+
+The following descriptions detail how an Angular-Hint module should be developed in order to integrate it with the overall design.
+
+Angular-Hint Conventions
+------------------------
+
+  1. Module Definition
+
+  The Angular-Hint module should be named in the format of `ngHintModuleName` when it is defined. For example:
+
+  ```javascript
+  angular.module('ngHintControllers', [])
+  ```
+  The module should be defined in a file called hint-module-name.js.
+  For example:
+
+  ```javascript
+  hint-controllers.js
+  ```
+  It should have a corresponding test file `hint-module-name_test.js`.
+
+  Preferably module names should consist of one descriptive word. If a one word description is too vague to convey the scope of the module, the shortest expression possible is preferred.
+
+  2. Module Dependencies
+
+  Each Angular-Hint module should load its own dependencies using `browserify`. For instance, `ngHintDom` depends on the library `domInterceptor`. This dependency is included within `ngHintDom` by the browserify `require` function.
+
+  All ngHint modules should load ngHintLog as a dependency, see #3.
+
+  3. Message Logging
+
+  All ngHint modules should use ngHintLog to log warnings. This creates a standard look and feel for all Angular-Hint messages.
+
+  To use ngHintLog, see its [README.md](https://github.com/angular/angular-hint-log#angular-hint-log).
+
+  4. Module Loading
+
+  To be included in AngularHint, an ngHintModule needs to be included in the `allModules` list in `hint.js`. Submit a PR request updating this array as well as the package.json dependency of your ngHint module to this repository to allow your ngHint module to be loaded using the `ng-hint` directives.