Add branching challenge sheet

Author: adhamcodes

Module_2_Branching/Exercises/README.md

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+# Module 2 Exercises — Branching
+
+Use the disposable student lab.
+
+## Challenge 1 — Predict branch movement
+
+Create two commits on `main`, create a feature branch, add two more commits there, and draw the commit graph you expect before inspecting it.
+
+Then run:
+
+```bash
+git log --oneline --graph --decorate --all
+```
+
+Explain what the branch names point to.
+
+## Challenge 2 — Fast-forward vs merge commit
+
+Produce one merge that can fast-forward and one merge where both branches have diverged.
+
+Before each merge, predict the resulting graph.
+
+**Pass when:** you can explain why the outcomes differ without describing branches as folders or copies.
+
+## Challenge 3 — Branch cleanup
+
+Merge a finished feature, verify the work is reachable from `main`, then delete the local feature branch.
+
+Explain why deleting the branch name does not delete commits that remain reachable from `main`.
+
+## Boss check — Unknown graph
+
+Create a small history with at least three branches and six commits. Leave it for a while, return without notes, inspect it, and explain which work is merged and which work remains isolated before running a merge command.