You can now import your notes from Evernote.
To do so you have to select all your notes and right click on them in your Evernote desktop client. Now select export notes and store them to an enex file.
Then click Import / Import notes from Evernote in the QOwnNotes main menu and import the enex file.
Formattings like bold and italic will be converted to markdown, as are headlines and links. Images from your Evernote notes will be embedded in your QOwnNotes markdown notes.
You can download QOwnNotes on the installation page.