add merge

GIT_ASSIGNMENT.md

@@ -148,6 +148,14 @@
 
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+## 🕵️ Step 15: Git Merge
+
+🔎 _Tracked who last modified each line of a file using_ `git merge filename`.
+
+![Git blame](merge.png)
+
+---
+
 # ✨ Wrap-Up Notes
 
 1. ✅ **Git Version Check** – Confirmed installation.
@@ -162,6 +170,7 @@
 10. ✅ **Git Remote** – Checked repository connections.
 11. ✅ **Git Ignore** – Excluded unnecessary files.
 12. ✅ **Git File History & Blame** – Tracked changes and contributors line by line.
+13. ✅ **Git Merge** – Identifies who last modified each line in the file..
 
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