Added template for project READMEs.

projects/README.template

+# Modelling ...
+
+<link to project in MA>
+
+<hint if this is part of a multi-model-type project>
+
+<very concise project description>
+
+<how are the ModelCIF files created using this software>
+
+These models qualify as "<model type>".
\ No newline at end of file