feat: Add initial LAB2-3 project presentation and areas for improvement

LAB3/LAB3.md

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+
+# LAB3 Project Presentation
+
+## Project Description
+
+*To be completed: Add a description of the LAB3 project here.*
+
+## Block Diagram
+
+*To be completed: Add a block diagram of the LAB3 system here (e.g., using Mermaid or an image).* 
+
+## Areas for Improvement
+
+- JSTK: Non-atomicity in writing to the RGB LED; the rest is well done and clear.
+- Mute: (IF s_axis_tvalid = '1' AND m_axis_tready = '1' THEN) AXIS error; s_axis_tready should be checked. The original would be correct if s_axis_tready was directly connected to m_axis_tready. As written, it waits for ready to assert valid.
+- Volume controller: Waits for ready to assert valid (IF s_axis_tvalid = '1' AND m_axis_tready = '1' THEN).
+- Balance: (IF s_axis_tvalid = '1' AND m_axis_tready = '1' THEN) AXI condition is incorrect; the rest is correct.