Add README files to samples

samples/README.md

@@ -0,0 +1,11 @@
+This directory contains samples that we run to test different scenarios and features. 
+
+All samples use the Boot starter and expose a GraphiQL page where you can run queries. Simply start the `main` application class and go to http://localhost:8080/graphiql. 
+
+To run from the command line, use:
+```shell script
+$ ./gradlew :samples:{sample-directory-name}:bootRun
+```
+
+Samples have integration tests you can run with a debugger.
+