Add trivial_save.py example

examples/trivial_save.py

@@ -0,0 +1,10 @@
+import dprov
+
+if __name__ == "__main__":
+
+    # Inspect the schema of the default in-memory database (created on first
+    # import of dprov module)
+    for c in dprov._conn.iterdump():
+        print(c)
+
+    dprov.save_data({}, desc="This example script actually saves nothing")