chore: update Readme

Signed-off-by: Simon Schrottner <simon.schrottner@dynatrace.com>

README.md

@@ -1 +1,112 @@
-# community-tooling
+# Community Tooling
+
+This repository contains tools to handle our community, like our peribolos-config-merger.
+
+## Releasing
+
+Create a GitHub Release with a tag in the format of `v<major>.<minor>.<patch>` and this will trigger the automatic releasing process.
+
+## Tools
+
+### Peribolos config merger
+
+The merger contains our custom generation logic for the peribolos configuration.
+
+Within the `config` directory, we are storing our configurations.
+(this can be overwritten with a config flag (`--config`) when executed).
+
+#### Configuration Structure
+
+Each directory within the `config` directory represents a GitHub Organization (therefore we will refrain from it as `org-folder`).
+This directory will only be picked up when there is a `org.yaml` within the directory.
+
+Within this `org-folder` we can have multiple teams/workgroups.
+Those teams are represented with their subfolder (the name of the team) containing a `workgroup.yaml`.
+
+The merger will fetch these configurations and generate a proper peribolos configuration based on this.
+
+##### org.yaml
+
+The `org.yaml` follows the default peribolos configuration format.
+
+It will be used to:
+
+- define members and admins of the organization
+- define default settings for the organization such as:
+  - members allowed to create repositories
+  - default permissions for members
+  - ...
+- repositories and their configuration
+- global teams
+
+###### special teams
+
+There are 3 special teams within the `org.yaml`.
+
+##### &lt;workgroup&gt;/workgroup.yaml
+
+Each workgroup represents an organizational unit, which needs to work on the same repositories.
+
+A workgroup consists of following roles:
+
+- approvers (triage permission)
+- maintainers (maintain permission)
+- admins (admin permission)
+
+Based on the definition above a `workgroup.yaml` has the following structure:
+
+```yaml
+repos: # a list of repositories the team has access to
+  - repo-1
+  - repo-2
+
+approvers:
+  - approver-1
+
+maintainers:
+  - maintainer-1
+
+admins:
+  - admins-1
+```
+
+Repositories are not mutually exclusive to workgroups.
+Hence, multiple workgroups can have access to the same repositories.
+
+> **Note**
+> Use admins carefully and only when it is really needed.
+> Admins can change secrets etc.
+
+Based on this configuration we will generate 3 teams:
+
+- &lt;workgroup&gt;-approvers
+- &lt;workgroup&gt;-maintainers
+- &lt;workgroup&gt;-admins
+
+Furthermore, we will assign those 3 teams also permissions for the defined repositories.
+
+##### Example
+
+Let's say we have a `workgroup.yaml` within `org-folder/workgroup`.
+
+The content is:
+
+```yaml
+repos:
+  - repo-1
+
+approvers:
+  - approver-1
+
+maintainers:
+  - maintainer-1
+
+admins:
+  - admins-1
+```
+
+Following Teams will be generated, with the respective permissions for the repository `repo-1`:
+
+- workgroup-approvers: triage
+- workgroup-maintainers: maintain
+- workgroup-admins: admin