add astra code example

git push origini code example install jupyter ubuntu code example build signed apk react native code example how to run javascript scripts code example tab panel bootstrap 3\ code example how to import python modules from a separate director code example bootstrap hide menu on mobile code example VM2901:1 Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0 code example pip3 list packages code example npm i body-parse code example command prompt input in node.js code example python convert base 10 to binary code example