add examples that obfuscates code

[ObjectIsAdvantag]

we already propose an example that minifies code,

would be interesting to have obfuscation too:

• tested by Yusof: https://javascriptobfuscator.com/protect-javascript.aspx
• not tested: https://obfuscator.io/

note: jcompress does an uglify + compress, could be interesting to investigate too https://jscompress.com/