add run command for pipelines

Author: semiherdogan

docs/commands/pipeline.md

@@ -17,4 +17,7 @@ All commands for pipeline.
 `bb pipeline latest` Gets details of latest pipeline.
 
 ## Wait
-`bb pipeline wait <pipeline id>` Hangs on terminal, until given pipeline finishes.
+`bb pipeline wait <pipeline id>` Hangs on terminal, until given pipeline finishes.
+
+## Run
+`bb pipeline run <branch-name>` Runs pipeline for given branch (defined in bitbucket-pipelines.yml file).