Add examples of syntax

examples/prod-requirements.txt

@@ -0,0 +1,11 @@
+#
+# This file is autogenerated by pip-compile
+# Make changes in requirements.in, then run this to update:
+#
+#    pip-compile requirements.in
+#
+flask==0.10.1
+itsdangerous==0.24        # via flask
+jinja2==2.8               # via flask
+markupsafe==0.23          # via jinja2
+werkzeug==0.11.2          # via flask