build: add crossplatform pyInstaller builds (first attempt)

Signed-off-by: Stephen L. <LRQ3000@gmail.com>

.github/workflows/pyinstaller.yml

@@ -0,0 +1,16 @@
+# Crossplatform pyInstaller builds using GitHub Actions
+
+name: pyinstaller
+
+jobs:
+  pyinstaller-build:
+    runs-on: [ ubuntu-latest, windows-latest, macos-latest ]
+    steps:
+      - name: Create Executable
+        uses: sayyid5416/pyinstaller@v1
+        with:
+          python_ver: '*'
+          #spec: 'src/build.spec'
+          #requirements: 'src/requirements.txt'
+          upload_exe_with_name: 'webactogram'
+          options: --onefile, --name "webactogram", --windowed,