Common subcommand naming scheme (#208)

drop tea mile alias

document command schema in CONTRIBUTING.md

and update this file, its a plain copy from gitea

add "list" as alias for "ls" subcommand

add singular command aliases

Co-authored-by: Norwin Roosen <git@nroo.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/208
Reviewed-by: 6543 <6543@noreply.gitea.io>
Reviewed-by: techknowlogick <techknowlogick@gitea.io>

cmd/repos.go

@@ -18,8 +18,9 @@ import (
 // CmdRepos represents to login a gitea server.
 var CmdRepos = cli.Command{
 	Name:        "repos",
-	Usage:       "Show repositories details",
-	Description: "Show repositories details",
+	Aliases:     []string{"repo"},
+	Usage:       "Show repository details",
+	Description: "Show repository details",
 	ArgsUsage:   "[<repo owner>/<repo name>]",
 	Action:      runRepos,
 	Subcommands: []*cli.Command{