Added Release.md

Release.md

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+This is the first official release of **Rotorflight Lua Scripts for Ethos**.
+
+*Rotorflight* is a _Flight Control_/_FBL_ Software Suite for traditional single-rotor RC helicopters. It is based on Betaflight, enjoying all the great features of the Betaflight platform, plus many new features added for helicopters.
+
+*Rotorflight Lua Scripts for Ethos* is a package of Ethos Lua scripts for configuring the Rotorflight flightcontroller from the transmitter.
+
+## Requirements
+
+- Ethos 1.1.0 or later
+- an X10, X12, X18, X20 or Twin X Lite transmitter
+- a FrSky Smartport or F.Port receiver using ACCESS, ACCST, TD or TW mode
+
+## Tested Receivers
+
+The following receivers were correctly working with an X18 or X20 transmitter.
+- TD MX 1.0.10
+- R9 MX ACCESS 1.3.2
+- R9 Mini ACCESS 1.3.1
+- Archer RS ACCESS 2.1.10
+- RX6R ACCESS 2.1.8
+- R-XSR ACCESS 2.1.8
+- R-XSR ACCST FCC F.port 2.1.0
+- Archer Plus RS and Archer Plus RS Mini ACCESS F.Port 1.0.5
+
+Note: when saving changes fails, the scripts will automatically retry. The R-XSR and the Archer Plus RS (Mini) seem to retry regularly, while the other receivers rarely do this.
+
+## Installation
+
+Download the the zip file under *Assets* latest files and copy the `RF` folder to the `scripts` folder on your transmitter. You will know if you did this correctly if the *Rotorflight* tool shows up on the Ethos system menu.
+
+### Copying the RF folder
+
+USB Method
+
+1. Power on your transmitter.
+2. Connect your transmitter to a computer with an USB cable.
+3. Select *Ethos Suite* on the transmitter.
+4. Open the new drive on your computer.
+5. Unzip the file and copy the RF folder to the scripts folder on the SDCARD drive.
+6. Eject the drive.
+7. Unplug the USB cable.
+8. Turn off the transmitter and re-power it.
+
+SD Card Method
+
+1. Power off your transmitter.
+2. Remove the SD card and plug it into a computer.
+3. Unzip the file and copy the RF folder to the scripts folder on the SDCARD drive.
+4. Eject the SD card.
+5. Reinsert your SD card into the transmitter.
+6. Power up your transmitter.
+
+## Usage
+
+See the [Lua Scripts Wiki page](https://github.com/rotorflight/rotorflight/wiki/Lua-Scripts).
+
+## Credits
+
+Thanks go out to everyone who contributed along the way, especially the Betaflight and Rotorflight teams and the following Ethos users:
+- **Bender** - testing and suggestions
+- **egon** - Lua script maintainer
+- **James-T1** - author of the first Lua scripts for Ethos
+- **rob.thomson** - providing hardware, testing and suggestions