iox-#2 Add simple README for the git-hooks

tools/git-hooks/README.md

@@ -0,0 +1,16 @@
+# Git Hooks for iceoryx-rs
+
+The provided hooks add the github issue number to the commit message
+and check for trailing whitespaces and code style violations with `cargo fmt`.
+
+## Installation
+
+The hooks are active when you add the `git-hooks` directory as hooks folder to
+your local project git config:
+
+```bash
+git config core.hooksPath tools/git-hooks/
+```
+
+With that you will also receive the updates of the git hooks in the future.
+We recommend doing this in every new clone you did on iceoryx-rs.