update readme/changelog & some fixes

documentation/SubGHzRemotePlugin.md

@@ -0,0 +1,72 @@
+# UniRF Remix
+
+### The UniRF Tool *requires* the creation of custom user map with `.txt` extension in the `unirf` folder on the sdcard. 
+
+#### If these files are not exist or not configured properly, **you will receive an error each time you try to select wrong file in the UniRF Tool**.
+
+## You can add as many `.txt` map files as you want, file name doesn't matter!
+
+### App currenty works only with RAW subghz files
+
+## Incorrect or unconfigured file error
+
+If the `.txt` file has not been properly configured, the following error will be thrown when trying to run the UniRF Remix app:
+
+```
+Invalid map file!
+
+Please reconfigure
+your map file.
+
+Hold Back to Exit
+```
+
+
+
+## Setting up the `unirf/example.txt` file:
+
+```
+UP: /ext/subghz/Up.sub
+DOWN: /ext/subghz/Down.sub
+LEFT: /ext/subghz/Left.sub
+RIGHT: /ext/subghz/Right.sub
+OK: /ext/subghz/Ok.sub
+ULABEL: Up Label
+DLABEL: Down Label
+LLABEL: Left Label
+RLABEL: Right Label
+OKLABEL: Ok Label
+```
+
+The UP/DOWN/LEFT/RIGHT/OK file locations must be set to the specific file you want mapped to that directional pad direction.
+
+The ULABEL/DLABEL/LLABEL/RLABEL/OKLABEL variables should be set to the text to be displayed for each of the files set earlier.
+
+## Example:
+
+```
+UP: /ext/subghz/Fan1.sub
+DOWN: /ext/subghz/Fan2.sub
+LEFT: /ext/subghz/Door.sub
+RIGHT: /ext/subghz/Garage3.sub
+OK: /ext/subghz/Garage3l.sub
+ULABEL: Fan ON
+DLABEL: Fan OFF
+LLABEL: Doorbell
+RLABEL: Garage OPEN
+OKLABEL: Garage CLOSE
+```
+
+## Notes
+* ##### App Usage
+  - Press a button to send the assigned capture file.
+  - Press Back button to set how many repeats the app should send. Capped at 5 repeats.
+  - Hold Back button to exit app.
+  - Only RAW SubGhz captures are supported currently.
+  - No skip function.
+
+* ##### Universal RF Map
+  - File path should not have any spaces or special characters (- and _ excluded).
+  - Labels are limited to 12 characters.
+    - Why? This is to prevent overlapping elements on screen.
+    - For example: If you set your label or file to ```WWWWWWWWWWWWWWW``` you'll be over the screen limits.