add capabilities to app. resolves issue #173

[sorbaugh]

resolves #173

Tested locally via OCS API call /ocs/v2.php/cloud/capabilities

Capability is called "downloadlimit" under Files

[sorbaugh]

Done^^ We could think about refactoring other capabilities to this structure as well, however can't say how many clients that would break, so probably best to leave it alone for now.

[AndyScherzinger]

Yeah, let's not touch other capabilities for exactly that reason 👍

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[AndyScherzinger]

can you do a release @skjnldsv ? 😃