Install-Development-version.md

-To install Sverchok the way you can develop it, test, and work with Github:
+### To install Sverchok the way you can develop it, test, and work with Github for ~/src and ${BLENDER_VERSION}:
 
 ```
 $ cd src/
@@ -9,4 +9,12 @@ $ ln -s ~/src/sverchok ~/.config/blender/${BLENDER_VERSION}/scripts/addons/
 
 After this, go to Blender preferences, locate Sverchok addon and enable it as usual.
 
-Now you can use Sverchok and develop it within the same installation.
+Now you can use Sverchok and develop it within the same installation.
\ No newline at end of file
+
+### Tips
+howto install blender addons from github with one command.
+for ~/git directory blender 2.9:
+```
+alias LNaddon='{ read -r url&&cd ~/git&&git clone $url&&bn=$(basename $url .git)&&cd $bn&&d=$(pwd)&&us=$(users)&&ln -s $d /home/$us/.config/blender/2.93/scripts/addons/&&echo "2.90 linked" ;} <<< '
+
+```