chore: Reworking the icons build system in order to make it less painful

CONTRIBUTING.md

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+Contributing guidelines
+=======================
+
+> Note: this document is intended as a draft, it will be updated soon
+
+### Requirements:
+
+* Nodejs ^6.x
+* Visual Studio Code
+
+### Installing and compiling source
+
+First you will have to install node_modules through npm or yarn
+
+```shell
+npm install
+# or
+yarn install
+```
+
+To compile to the source code, you have to execute the build task through visual studio code.
+First you need to invoke to quick command (on MacOS `⌘P`, while on Linux/windows is `ctrl+p`)
+then type `task build` and wait until vsc will have finished the task.
+
+### Testing the theme
+
+To test the theme, you will have to go to the debug section, select the *Launch Extension* from debug and execute it.
+
+### Adding new Material Theme commands
+
+Soon(ish)®
+
+### Adding new icons
+
+* Add your icon to the `~/src/icons/svgs` directory.
+
+* Add the reference to that icon to the `~/src/icons/partials/fileNames.js` or if your icon is referred to a directory adds the reference to the `~/src/icons/partials/folderNames.js` file, otherwise to `~/src/icons/partials/fileExtensions.js` if is referred to a file extension.
+
+* If you want to make the icon sensitive to be accented, modify the `~/extensions/defaults.json` file, adding the icon definition to the `accentableIcons` array (e.g. ["_folder_open", "_folder_open_build"]) and the path to the `icons.theme.iconDefinitions` object.
+
+* Execute the build command.
+
+* Enjoy your new icons in Material Theme, and don't forget to pull request!