Initialize ATEM-UI workspace with gpui core

Author: Misei.

.github/workflows/ci.yml

@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust (stable + components)
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cargo fmt (check)
+        run: cargo fmt --all -- --check
+
+      - name: Cargo clippy (deny warnings)
+        run: cargo clippy --workspace --all-targets --all-features -- -D warnings
+
+      - name: Cargo check
+        run: cargo check --workspace
+
+      - name: Cargo test (compile only)
+        run: cargo test --workspace --no-run
+

.gitignore

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+/target/
+/.idea/
+/.vscode/
+*.log
+*.swp
+*.swo
+