Swift package

* Added the Keychain package
* Added a Makefile to easily build the package
* Added a Gitea pull request action
* Updated the README with additional information

Co-authored-by: Bram Kolkman <bramkolkman@thinkerium.com>
Reviewed-on: #1

.gitea/workflows/pr.yml

@@ -0,0 +1,18 @@
+name: Build
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      
+      - name: Resolve dependencies
+        run: make resolve
+
+      - name: Build package
+        run: make build