organization.md file (fixes aframevr#970)

ORGANIZATION.md

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+# Directory Structure
+
+- `dist` - Builds for both the stable version and the bleeding-edge version, including minified. Generated with `npm run dist`.
+- `docs` - Complete documentation in Markdown. Used to generate the documentation on the [A-Frame Site](https://github.com/aframevr/aframe-site).
+- `examples` - Examples. `index.html` lists all of the examples.
+- `src` - Source code.
+  - `components` - Standard components. They are required via `components/index.js`.
+    - `scene` - Standard components that apply only to the scene.
+  - `constants` - Common constants.
+  - `core` - Core custom elements and API.
+    - `scene` - Scene custom element and modules.
+  - `extras` - Convenience and abstraction layers such as primitives.
+    - `primitives` - Code for registering primitive custom elements.
+      - `primitives` - Standard primitives such as `<a-box>`.
+  - `index.js` - Main file that will be exported to `window.AFRAME`.
+  - `lib` - Integration with third-party modules.
+  - `shaders` - Standard shaders. They are required via `shaders/index.js`.
+  - `style` - Core CSS.
+  - `systems` - Standard systems. They are required via `systems/index.js`.
+  - `utils` - Utility function and modules. They should all be exposed in `utils/index.js` which is exported to `window.AFRAME.utils`.
+- `tests` - Functional and unit tests with Karma, Mocha, Sinon, and Chai.
+- `vendor` - Third-party modules not available via NPM.
+
+# Major Dependencies
+
+- [document-register-element](https://github.com/WebReflection/document-register-element) - Polyfill for the Custom Elements specification.
+- [three.js](https://github.com/mrdoob/three.js) - 3D library.
+- [tween.js](https://github.com/tweenjs/tween.js/) - Animation and interpolation library.
+- [webvr-polyfill](https://github.com/borismus/webvr-polyfill) - Polyfill for the WebVR specification.