update README.md

README.md

@@ -6,6 +6,39 @@ The reference implementation is completely in-memory.
 
 See [Help Wanted: Database Plugins (for saving certs)](https://github.com/Daplie/node-letsencrypt/issues/39)
 
+How to create a custom strategy
+===============================
+
+Let's say there's some new database AwesomeDB that
+we want to make a plugin for, here's how we'd start:
+
+```bash
+# First create you repo on github or wherever
+# Then clone it
+git clone git@github.com:AwesomeDB/le-store-awesome.git
+
+pushd le-store-awesome
+
+git pull https://github.com/Daplie/le-store-SPEC.git template
+
+git push
+```
+
+Or, if you already have some code and just need to merge in the tests:
+
+```bash
+git pull https://github.com/Daplie/le-store-SPEC.git tests
+```
+
+Next, Just run the tests
+
+```
+node tests/basic.js
+```
+
+Note: you should not modify the tests that come from the tests branch,
+but rather create separate files for your own tests.
+
 API
 ===