Add contribute instructions

Author: kristijanhusak

README.md

@@ -1 +1,41 @@
 # Nvim Orgmode Docs
+
+Documentation for [nvim-orgmode](https://github.com/nvim-orgmode/orgmode)
+
+
+## How to contribute
+All documentation is in rst format inside `docs/` folder.
+Once the docs are merged into the `main` branch Github Action deploys it to `gh-pages` branch automatically
+
+
+## View documentation locally
+
+To preview documentation locally, few dependencies needs to be installed:
+
+### Dependencies
+Ubuntu:
+```
+sudo apt-get install -y python3-sphinx python3-sphinx-rtd-theme
+```
+
+Arch:
+```
+sudo pacman -S python-sphinx python-sphinx_rtd_theme
+```
+
+For other platforms, see [Getting started with sphinx](https://docs.readthedocs.io/en/stable/intro/getting-started-with-sphinx.html).
+
+### Build
+
+To build the documentation, go into the `docs/` folder and run `make html`:
+
+```
+cd docs/
+make html
+```
+
+This will generate `_build` folder inside the `docs/`, and you can just open it up:
+
+```
+xdg-open _/build/html/index.html
+```