Add API-Readiness-Checklist.md to RM project

documentation/API-Readiness-Checklist.md

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+# API Readiness Checklist
+| Nr | API release assets                           | alpha | release-candidate |  public-release<br>initial | public-release<br> | Status for <api-name> <version> in rX.Y |
+|----|----------------------------------------------|-------|-------------------|---------|--------|
+|  1 | API definition                               |   M   |         M         |    M    |    M   |
+|  2 | Design guidelines from Commonalities applied |   O   |         M         |    M    |    M   |
+|  3 | Guidelines from ICM applied                  |   O   |         M         |    M    |    M   |
+|  4 | API versioning convention applied            |   M   |         M         |    M    |    M   |
+|  5 | API documentation                            |   M   |         M         |    M    |    M   |
+|  6 | User stories                                 |   O   |         O         |    O    |    M   |
+|  7 | Basic API test cases & documentation         |   O   |         M         |    M    |    M   |
+|  8 | Enhanced API test cases & documentation      |   O   |         O         |    O    |    M   |
+|  9 | Test result statement                        |   O   |         O         |    O    |    M   |
+| 10 | API release numbering convention applied     |   M   |         M         |    M    |    M   |
+| 11 | Change log updated                           |   M   |         M         |    M    |    M   |
+| 12 | Previous public-release was certified        |   O   |         O         |    O    |    M   |