Merge pull request #958 from 0xc0170/new_target_req

workflow: add new target requirement - tests provided

Author: Amanda Butler

docs/reference/contributing/guidelines/workflow.md

@@ -90,8 +90,11 @@ Release: feature
 
 Updating target implementation (adding a new target or updating already supported target) is a change for a patch release.
 
+A test report for the new target must be part of the pull request. The new target must pass all Mbed OS functional and system validation tests (using `mbed test` command) for the current Mbed OS major release, including all Mbed OS supported toolchains.
+
 Release: patch
 
+
 #### Functionality change
 
 A functionality change can be any change in the functionality, including adding a new feature, a new method or a function. Software language does not matter.