Update README.md

Author: eduard93

README.md

@@ -6,6 +6,7 @@ Various GitLab hooks. For more information please read a series of articles on C
 - [Part II: GitLab workflow](https://community.intersystems.com/post/continuous-delivery-your-intersystems-solution-using-gitlab-part-ii-gitlab-workflow)
 - [Part III: GitLab installation and configuration](https://community.intersystems.com/post/continuous-delivery-your-intersystems-solution-using-gitlab-part-iii-gitlab-installation-and) 
 - [Part IV: CD configuration](https://community.intersystems.com/post/continuous-delivery-your-intersystems-solution-using-gitlab-part-iv-cd-configuration)
+- [Part V: Why containers?](https://community.intersystems.com/post/continuous-delivery-your-intersystems-solution-using-gitlab-part-v-why-containers)
 
 # Installation
 
@@ -24,8 +25,19 @@ Available settings:
 | Setting | Sample Value           | Description                                                                                     |
 |---------|------------------------|-------------------------------------------------------------------------------------------------|
 | ext     | $lb("xml")             | List of files extensions to load and compile.                                                   |
-| tests   | MyApp/Tests             | Path relative from the repo root to the test suite.                                                 |
+| tests   | MyApp/Tests            | Path relative from the repo root to the test suite.                                             |
 | commit  |                        | Do not set. Current commit hash.                                                                |
-| init    | Package.Class:Method   | Code called before loading files.                                                               |
+| hooks   | MyApp/Hooks/           | Path relative from the repo root to the hooks.                                                  |
 | delete  | Package.Class:Method   | Code called to delete files from project. Should accept one argument - list of files to delete. |
 | url     | http://127.0.0.1:57772 | Server root.                                                                                    |
+
+
+## Hooks
+
+There are two types of hooks available:
+
+- **Global** - executed each time the CI is run. Extend `isc.git.hook.Global`. 
+- **Local** - executed once. Extend `isc.git.hook.Local`.
+
+Hooks of the same type are executed in collation order. To create a hook extend either or `isc.git.hook.Global` or `isc.git.hook.Local` and implement `onBefore` and/or `onAfter` methods.
+