User documentation

This is a work-in-progress effort to document things relevant to Password Store users. The currently available topics are listed below.

• Autofill : How to use and enable autofill in APS
• Background killing bugs : Bugs in XiaoMi and Nokia phones resulting from shoddy manufacturer 'optimisations'
• Build types : Explains the differences between the free and nonFree build types of APS
• Importing from other password managers : How to migrate to pass
• Invalid GPG key ID : Why this error happens and how you can fix it
• Release channels : Different ways to get prebuilt binaries of APS
• Reporting bugs : Helpful information on how to craft good bug reports