added assignments 2 and 3

Author: danieldia-dev

.github/workflows/lean_action_ci.yml

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+name: Lean Action CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+      - uses: leanprover/lean-action@v1

.gitignore

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+/.lake

Main.lean

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+import Proof101Problems
+
+def main : IO Unit :=
+  IO.println s!"Hello, {hello}!"

Proof101Problems.lean

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+-- This module serves as the root of the `Proof101Problems` library.
+-- Import modules here that should be built as part of the library.
+import Proof101Problems.Basic

Proof101Problems/Basic.lean

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+def hello := "world"