Add MIT license, GitHub Actions CI workflow, README badges

Author: Developer-RU

.github/workflows/build.yml

@@ -0,0 +1,25 @@
+name: PlatformIO Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install PlatformIO
+        run: pip install platformio
+
+      - name: Build firmware
+        run: pio run

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Developer-RU
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,5 +1,10 @@
 # ESP32 BLE Legacy DFU Template
 
+[![PlatformIO Build](https://github.com/Developer-RU/ESP32-BLE-OTA/actions/workflows/build.yml/badge.svg)](https://github.com/Developer-RU/ESP32-BLE-OTA/actions/workflows/build.yml)
+[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](LICENSE)
+[![Platform: ESP32](https://img.shields.io/badge/Platform-ESP32-green.svg)](https://docs.platformio.org/en/latest/boards/espressif32/esp32dev.html)
+[![iOS App](https://img.shields.io/badge/iOS_App-GitHub-black?logo=github)](https://github.com/Developer-RU/ESP32-DFU-iOS)
+
 Production-ready ESP32 firmware template for OTA updates over **Bluetooth Low Energy (BLE)** using the **Nordic Legacy DFU profile**.
 
 This repository focuses on the ESP32 firmware side.
@@ -135,4 +140,4 @@ Keep this repository focused on firmware template quality and embedded protocol
 
 ## License
 
-Add your preferred license before publishing (for example, MIT or Apache-2.0).
+This project is licensed under the [MIT License](LICENSE).