Add actions to build

Improve readme.

Author: kaklik

.github/workflows/build.yml

@@ -0,0 +1,22 @@
+name: "FAP: Build"
+on: [push, pull_request]
+jobs:
+  ufbt-build-action:
+    runs-on: ubuntu-latest
+    name: 'ufbt: Build for Release branch'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Build with ufbt
+        uses: flipperdevices/[email protected]
+        id: build-app
+        with:
+          # Set to 'release' to build for latest published release version
+          sdk-channel: release
+          app-dir: servotester
+      - name: Upload app artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ github.event.repository.name }}-${{ steps.build-app.outputs.suffix }}
+          path: ${{ steps.build-app.outputs.fap-artifacts }}
+

README.md

@@ -1,13 +1,20 @@
 # Flipper servotester application
 
-Application uses A7 pin for servo PWM output. Has different modes: Manual, Center, Auto.
+This application could be used for testing devices containing standard [RC servo](https://en.wikipedia.org/wiki/Servo_(radio_control)), by generating a [PWM RC servo signal](https://en.wikipedia.org/wiki/Servo_control). 
 
 ## Installation instructions
 
-Go to the [releases](https://github.com/spin7ion/flipper-servotester/releases), download apps.zip and extract it in your SD card.
+Install application from [Flipper Zero application catalog](https://docs.flipper.net/apps), or go to the releases, download apps.zip and extract it in your SD card.
+
+## Usage
+
+- Connect the Servo PWM input to **A7** Flipper Zero in.
+- Enable 5V output in the GPIO menu or plug-in USB-C charging cable. (If you're supplying power from an external power source, make sure it has common ground with the flipper GND)
+- Start the ServoTester app
+- Test different servo positions
 
 ## Build instructions
 
 - Clone the [official flipper zero firmware](https://github.com/flipperdevices/flipperzero-firmware)
 - Add the content of this repo to the `applications_user` folder
-- Follow [official instructions](https://github.com/flipperdevices/flipperzero-firmware/blob/dev/documentation/AppsOnSDCard.md)
+- Follow [official instructions](https://github.com/flipperdevices/flipperzero-firmware/blob/dev/documentation/AppsOnSDCard.md)