Add poke_destkop_app_readme.md

poke_destkop_app_readme.md

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+Requirements:
+
+- Python 3
+- GTK 3
+- VLC media player
+- YouTube-DL (`yt-dlp`)
+- Python modules: `gi`, `json`, `subprocess`, `urllib`
+ 
+on Trisquel GNU/Linux :
+```
+sudo apt install python3
+sudo apt install libgtk-3-dev
+sudo apt install yt-dlp
+```
+
+- Python modules: You need to ensure the following Python modules are installed:
+- gi
+- json
+- subprocess
+- urllib
+You can install them using pip:
+pip install pygobject for example