Resurrect project: repo cleanup, dual licensing, CI, and roadmap

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build:
+    name: Build firmware (PlatformIO)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Cache PlatformIO
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.platformio
+            ~/.cache/pip
+          key: ${{ runner.os }}-pio-${{ hashFiles('platformio.ini') }}
+          restore-keys: ${{ runner.os }}-pio-
+
+      - name: Install PlatformIO
+        run: |
+          python -m pip install --upgrade pip
+          pip install platformio
+
+      - name: Build
+        run: pio run

.gitignore

@@ -27,6 +27,14 @@ Network Trash Folder
 Temporary Items
 .apdisk
 
+## Autodesk EAGLE
+# Autosave/backup history and per-user preferences (keep .brd/.sch/.pro)
+*.b#*
+*.s#*
+*.l#*
+eagle.epf
+pcb/svg2poly.log
+
 ## VisualStudioCode Template
 .vscode/*
 !.vscode/settings.json
@@ -45,6 +53,9 @@ CMakeLists.txt
 CMakeListsPrivate.txt
 
 ### JetBrains template
+# This project does not track any IDE project files.
+.idea/
+
 # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
 # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839