Add create-exe workflow

.github/workflows/create-exe.yml

@@ -0,0 +1,52 @@
+name: Create Executables
+
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.9
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install pyserial pyinstaller
+
+      - name: Create the executable
+        run: pyinstaller --onefile ktool.py
+
+      - name: Upload the Mac executable
+        if: matrix.os == 'macos-latest'
+        uses: actions/upload-artifact@v2
+        with:
+          name: ktool-mac
+          path: dist/ktool
+
+      - name: Upload the Linux executable
+        if: matrix.os == 'ubuntu-latest'
+        uses: actions/upload-artifact@v2
+        with:
+          name: ktool-linux
+          path: dist/ktool
+
+      - name: Upload the Windows executable
+        if: matrix.os == 'windows-latest'
+        uses: actions/upload-artifact@v2
+        with:
+          name: ktool-win.exe
+          path: dist/ktool.exe