Add documentation on running tests

README.md

@@ -0,0 +1,17 @@
+== Testing ==
+
+The test target may be set using environment variables:
+
+```
+export RAPI_USERNAME=example
+export RAPI_PASSWORD=asdf
+export RAPI_HOST=ganeti.example.com
+```
+
+Other available environment variables:
+
+* `RAPI_PORT`: The target port (default: 5080)
+* `RAPI_VERSION`: The API version (default: 2)
+* `RAPI_TLS_VERIFY`: Should the certificate verification be enabled (default: false)
+
+Once the environment is configured, tests may be run using `go test`