add guide about matrix room creation

docs/guides/matrix-create-room.md

@@ -0,0 +1,53 @@
+---
+title: "Matrix: Create a New Room"
+---
+
+# Matrix: Create a New Room
+
+!!! success "Goal"
+
+    Create a new matrix room for a CCCHH group or function with correct protections and permissions
+
+## 1. Create the Room
+
+Rooms are always created by the *CCCHH-Admin* Account whose credentials can be found in *infra-secrets*.
+To create a room, log in to https://element.hamburg.ccc.de and click on *New Conversation* -> *New Room*.
+Enter a Room Name and optionally give it an address on the *hamburg.ccc.de* server.
+
+## 2. Configure Room Metadata
+
+Once the room is created, please give it a topic and if possible a room icon.
+This makes it easier to distinguish the many rooms we have.
+
+## 3. Invite the Moderation-Bot
+
+Either perform the following steps via the GUI or enter the displayed commands into the chat window of the new room:
+
+
+1. Invite the User `@moderation:hamburg.ccc.de` to the new room
+   ```
+   /invite @moderation:hamburg.ccc.de
+   ```
+
+2. Give the moderation bot *Admin* Power-Level so that it can properly enforce all protections
+   ```
+   /op @moderation:hamburg.ccc.de 100
+   ```
+
+## 4. Set Up Room Protection
+
+We have now added the moderation bot to the room but this is not enough.
+The bot needs to be told explicitly which rooms it should protect and the newly created one therefore needs to be added to that list.
+
+First, note down the *Internal Room ID* which can be found in the new Rooms settings under the *Advanced* tab.
+Then enter the *CCCHH Moderation Management* room and write the follogin mjolnir command while substituting the copied room id:
+
+```
+!mjolnir rooms add <room-id>
+```
+
+## Closing Up
+
+You should now have a new Matrix Room under moderation protection.
+To verify that everything was done correctly, you can enter `!mjolnir verify` in the *CCCHH Moderation Management* room and observe that the moderation bot does not give you an error.
+