Add tea repo create-from-template (#408)

I went with a new subcommand instead of `tea repo create --template`, as the options are quite different (bool instead of values, partially different set)

fixes #362

Co-authored-by: Norwin <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/408
Reviewed-by: Andrew Thornton <art27@cantab.net>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Norwin <noerw@noreply.gitea.io>
Co-committed-by: Norwin <noerw@noreply.gitea.io>

cmd/repos.go

@@ -27,6 +27,7 @@ var CmdRepos = cli.Command{
 		&repos.CmdReposList,
 		&repos.CmdReposSearch,
 		&repos.CmdRepoCreate,
+		&repos.CmdRepoCreateFromTemplate,
 		&repos.CmdRepoFork,
 	},
 	Flags: repos.CmdReposListFlags,