Add subpage for open source , code of conduct , dropdown for about us

[Teslimsama]

task #1

Summary

List of changes proposed in this PR (pull-request)

• add:subpage for code of conduct
• add:subpage for code of code translated in arabic
• add: subpage for open source - open_source.html
• add fitting for embeded video and making it fully responsive in open_source.html sub_page - style.css add: embeded youtube video for open source subpage - open_source.html
• add: embeded youtube video for open source subpage - open_source.html/li>

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