Document licensing best practices for Electron applications

[lee-dohm]

Some people find complying with licensing of Electron applications confusing. Some basic best practices would be very helpful. For example:

• How to publish a closed-source Electron application
• Proper licensing of any included codecs (or how to not include codecs that require licensing)
• How to include licenses of subcomponents of Electron in your finished product (to comply with licenses that require that)