Security - releases hashes (MD5, SHA, etc.)

[CalebJohn]

Verify download authenticity

@ajay welcome to the forum. The downloads are code-signed using Joplin's certificates so any modifications would show as a code-signing failure. Of course this does not apply to Linux AppImages so the devs provide a SHA512 hash for the AppImage so the download integrity can be confirmed. [hash]

On the github releases page.