Add example dev config file, config file docs.

examples/dev-cli.ini

@@ -0,0 +1,17 @@
+# This is an example configuration file for developers
+config-dir = /tmp/le/conf
+work-dir = /tmp/le/conf
+logs-dir = /tmp/le/logs
+
+# make sure to use a valid email and domains!
+email = foo@example.com
+domains = example.com
+
+text = True
+agree-eula = True
+debug = True
+# Unfortunately, it's not possible to specify "verbose" multiple times
+# (correspondingly to -vvvvvv)
+verbose = True
+
+authenticator = standalone