chore: Add spec.md

cli/spec.md

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+# Downpour CLI spec
+`downpour [command] --opts`
+## Commands:
+- new <path/s3 name> <public endpoint> - creates/initalizes a depot at the endpoint. Creates manifest.json and speedtest
+- connect <s3 endpoint> <key> <secret> [name] - connects to an s3 endpoint and saves the endpoint to some sort of credentials file. Name is either as provided or the hostname of the endpoint
+- upload <game id> <localpath> <path/s3 name> - uploads game as described before. Should fail if depot isn't initialized with new from above
+- copy <game id> <version id> <src path/s3 name> <dest path/s3 name> - copies between two depots
+- mark-exists <game id> <version id> <path/s3 name> - modifies depot's manifest.json to show content exists without copying (for third party copies) - maybe throw in checking one or two checks to see if they exist?
+- mark-absent <game id> <version id> <path/s3 name> - the same as above, but the reverse
+- rename <public endpoint> <new public endpoint> - renames an endpoint [NEEDS API ROUTES - can't do yet]
+- delete <public endpoint> - delete an endpoint [NEEDS API ROUTES - can't do yet]