Add module readme file

openpype/modules/shotgun/README.md

@@ -0,0 +1,26 @@
+## Getting started
+
+### First steps
+
+At the beginning you have to create a working environment, you can achieve it with bootstrap scripts from `tools` folder. Just follow the tutorial from the main `README.md` [file](../../../README.md).
+
+### Hooks
+
+You will need to install followed packages:
+ - pre-commit
+ - black
+ - mypy
+
+```bash
+pip install pre-commit black mypy
+```
+In order to make pre-commit work within the project you need to activate it at the root level.
+
+```bash
+pre-commit install
+```
+At the end you are supposed to see a message as below:
+```
+pre-commit installed at .git/hooks/pre-commit
+```
+Pre-commit will check your code style and formatting. You can configure the IDE of your choice to be able to use `pre-commit` and/or `black` formatter.