add: week2 project setup

Week-1/Days-update/Day1.md

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+# Day 1 Update
+
+- Set up the repository using Turborepo to organize the project as a monorepo.
+- Learned about the Scene Graph concept in Three.js.
+- Implemented the solar system from the Three.js manual scene graph tutorial: https://threejs.org/manual/#en/scenegraph
+- Started implementing the same solar system in React Three Fiber (R3F), but did not finish it yet.

Week-1/Days-update/Day2.md

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+# Day 2 Update
+
+- Built the React Three Fiber app for Task 1 (`Week-1/Task-1/r3f/solar-system`) with full Vite project setup and base files.
+- Implemented a simple solar system scene in R3F:
+	- Added Sun and Earth meshes.
+	- Created parent-child hierarchy using a `<group ref={orbitRef}>` for Earth orbit pivot.
+	- Animated orbit with `useFrame` by rotating the parent group each frame.
+- Added/updated documentation for the day:
+	- Added Day 1 summary (`Week-1/Days-update/Day1.md`).
+	- Updated Task 1 notes (`Week-1/Task-1/TaskNotes.md`) with Vanilla, R3F, and Thob comparison.
+	- Added Builder notes (`Week-1/Task-1/builder/BuilderNotes.md`) including observed warnings/errors and limitations.
+- Key learning: Scene graph parent-child transforms are straightforward in Vanilla and R3F, while Thob showed unstable behavior when changing child local position under parent transforms.