feat: Implement grant contract with basic functionality

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+name: Grant Smart Contract Tests
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install Rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          target: wasm32-unknown-unknown
+          override: true
+          components: rustfmt, clippy
+
+      - name: Install Stellar CLI
+        run: |
+          wget https://github.com/stellar/stellar-cli/releases/download/v25.1.0/stellar-cli-25.1.0-x86_64-unknown-linux-gnu.tar.gz
+          tar -xzf stellar-cli-25.1.0-x86_64-unknown-linux-gnu.tar.gz
+          sudo mv stellar-cli-25.1.0-x86_64-unknown-linux-gnu/stellar /usr/local/bin/
+
+      - name: Build Contract
+        run: cargo build --target wasm32-unknown-unknown --release
+
+      - name: Run Unit Tests
+        run: cargo test