add first bit of merging doc

branches.md

@@ -65,6 +65,20 @@ git push --set-upstream origin issuse99
 
 Now git will push the code to the remote repository and will also know what to do next time you run ```git push```
 
+Our git tree now looks something like this:
+
+```mermaid
+gitGraph
+    commit
+    commit
+    branch issue99
+    checkout issue99
+    commit
+    checkout main
+    commit
+    commit
+```
+
 ## Switching branches in the CLI
 
 - Open the terminal

merging.md

@@ -1,5 +1,50 @@
-## Merging
+# Bringing code back together
 
+## Merge Requests in Gitlab
+
+## Merging via the CLI
+Lets take our example of making a branch for **issue 99**, the diagram below shows the current state of the git repository.
+
+```mermaid
+gitGraph
+    commit
+    commit
+    branch issue99
+    checkout issue99
+    commit
+    checkout main
+    commit
+    commit
+```
+
+Merging this is pretty simple, you can do it with the following instructions.
+
+```bash
+# Switch back to the main branch
+git checkout main
+
+# Merge the branches
+git merge issue99
+
+# Push the changes to the remote repository
+git push
+```
+
+The diagram below shows what happened to our repository and how it got merged or flattened back into the **main** branch.
+
+```mermaid
+gitGraph
+    commit
+    commit
+    branch issue99
+    checkout issue99
+    commit
+    checkout main
+    commit
+    commit
+	 merge issue99
+    commit
+```
 ---
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