Add contribution guidelines (#31)

Author: MisanthropicBit

CONTRIBUTING.md

@@ -0,0 +1,9 @@
+# Contributing
+
+1. Fork this repository.
+2. Make changes.
+3. Make sure tests and styling checks are passing.
+   * Run tests by running `./tests/run_tests.sh` in the root directory. Running the tests requires [`plenary.nvim`](https://github.com/nvim-lua/plenary.nvim), [`neotest`](https://github.com/nvim-neotest/neotest), [`nvim-nio`](https://github.com/nvim-neotest/nvim-nio), and [`nvim-treesitter`](https://github.com/nvim-treesitter/nvim-treesitter). You may need to update the paths in `./tests/minimal_init.lua` to match those of your local installations to be able to run the tests.
+   * Install [stylua](https://github.com/JohnnyMorganz/StyLua) and check styling using `stylua --check lua/ scripts/ tests/ test_files/`. Omit `--check` in order to fix styling.
+4. Submit a pull request.
+5. Get it approved.

README.md

@@ -42,6 +42,7 @@ neovim as the lua interpreter.
 - [Debugging tests](#debugging-tests)
 - [Luarocks and Busted](#luarocks-and-busted)
 - [Running from the command line](#running-from-the-command-line)
+- [Contributing](#contributing)
 - [FAQ](#faq)
 
 <!-- panvimdoc-ignore-end -->
@@ -230,6 +231,10 @@ the `"integration"` task in a test file:
 require("neotest").run.run({ vim.fn.expand("%"), extra_args = { "--run", "integration" } })
 ```
 
+## Contributing
+
+Thanks for considering to contribute. Please see the instructions [here](/CONTRIBUTING.md).
+
 ## FAQ
 
 #### Q: Can I run async tests with neotest-busted?