Add README.md file (to show up in gitea / github / etc.)

Change-Id: Ic176636930e9a36cc428360147140a7339aa58b5

README.md

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+Osmocom TTCN-3 Test Suites
+==========================
+
+This repository contains a collection of test suites developed within
+the [Osmocom](https://osmocom.org/) (Open Source Mobile Communications)
+project.  The test suites are developed in the
+[TTCN-3](https://de.wikipedia.org/wiki/TTCN-3) programming language,
+compiled/executed by the [Eclipse TITAN](https://projects.eclipse.org/projects/tools.titan)
+compiler and runtime.
+
+Those test suites mostly are performing *functional testing* of cellular
+network elements, from 2G, 3G, 4G to 5G.  The individual test-suites are
+in sub-directories, while some shared library code is in *library*.
+
+
+Continuous Integration
+----------------------
+
+The individual tests suites are executed against different versions of
+the respective IUT (Implementation Under Test) by the Osmocom jenkins.
+
+See the [list of all TTCN-3 jenkins jobs](https://jenkins.osmocom.org/jenkins/view/TTCN3/)
+for more details
+
+
+Further reading
+--------------
+
+Some more information about those test suites can be found
+at <https://osmocom.org/projects/cellular-infrastructure/wiki/Titan_TTCN3_Testsuites>.