Tree-sitter parsers

The crate tree-sitter-parsers preinstalls the tree-sitter parsers for a number of programming languages.

Usage:

```rust use treesitterparsers::parse;

fn main() { let tree = parse("fn main() { }", "rust"); asserteq!(tree.rootnode().tosexp(), "(sourcefile (function_item name: (identifier) parameters: (parameters) body: (block)))"); } ```

In the above invocation of parse function, a string of the code is the first argument, and a string of the programming language is the second argument. Then as a result, the tree-sitter::Tree will be returned, where we can access it through the tree-sitter's API.

The list of supported languages are: bash c cpp c sharp css elm go html java javascript kotlin lua php python ruby rust scala solidity verilog yaml