Add extracted tools: CitrineOS, OpenOCPP, ShapeShifter

- CitrineOS core extracted (CSMS OCPP 2.0.1)
- OpenOCPP extracted (firmware OCPP 1.6J/2.0.1)
- ShapeShifter library installed (pip install -e)
- ShapeShifter specification extracted
- EVerest extracted

TODO updated with progress

tools/shapeshifter-specification-main/docs/message-descriptions/message-catalog/test-message.md

@@ -0,0 +1,21 @@
+<!--
+SPDX-FileCopyrightText: 2020-2023 Contributors to the Shapeshifter project
+
+SPDX-License-Identifier: Apache-2.0
+-->
+
+# TestMessage
+
+TestMessage does not have any content (other than the mandatory metadata) and may be used by implementations for (connectivity) testing purposes.
+
+XML representation summary
+
+```
+<TestMessage
+  Metadata...
+/>
+```
+
+|          |                                                                                                |
+|----------|------------------------------------------------------------------------------------------------|
+| Metadata | The metadata for this message. For details, see [metadata attributes](metadata-attributes.md). |