Add syntax docu, add VimL, CMake, INI, LESS syntax

closes #99
closes #106

assets/README.md

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+## Syntax Highlighting in bat
+
+`bat` uses the [syntect](https://github.com/trishume/syntect) library to highlight source
+code. As a basis, syntect uses [Sublime Text](https://www.sublimetext.com/) syntax definitions
+in the `.sublime-syntax` format.
+
+In order to add new syntaxes to `bat`, follow these steps:
+
+1. Find a Sublime Text syntax for the given language, preferably in a separate Git repository
+   which can be included as a submodule (under `assets/syntaxes`).
+
+2. If the Sublime Text syntax is only available as a `.tmLanguage` file, open the file in
+   Sublime Text and convert it to a `.sublime-syntax` file via *Tools* -> *Developer* ->
+   *New Syntax from XXX.tmLanguage...*. Save the new file in the `assets/syntaxes` folder.
+
+3. Run the `create.sh` script. It calls `bat cache --init` to parse all available
+   `.sublime-syntax` files and serialize them to a `syntaxes.bin` file (in this folder).
+
+4. Re-compile `bat`. At compilation time, the `syntaxes.bin` file will be stored inside the
+   `bat` binary.
+
+### Troubleshooting
+
+Make sure that the local cache does not interfere with the internally stored syntaxes and
+themes (`bat cache --clear`).
+
+### Manual modifications
+
+The following files have been manually modified after converting from a `.tmLanguage` file:
+
+* `VimL.sublime-syntax` => added `.vimrc` file type.