Add readme

README.md

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 # Symphony WDK Loader
+This loader allows WDK to be run in API mode while deploying SWADL files once from a designated location at startup.
+This allows secrets to be used in production when API-based deployments are not preferred.
+
+## Configuration
+1. Enable WDK API mode by setting `wdk.workflows.path` to an empty string and enabling the `monitoring-token` and `management-token` 
+2. Set `wdk.loader.path` to the actual path of where the SWADL files should be loaded from
+    ````yaml
+    wdk:
+      workflows.path: ""
+      loader.path: ./workflows
+      encrypt.passphrase: mysecretpassphrase
+      properties:
+        monitoring-token: mysecretpassphrase
+        management-token: mysecretpassphrase
+    ````
+3. Add secrets via environment variables prefixed with `WDK_` in the runtime location 
+   - e.g. adding a `WDK_secretToken` environment variable with a `abc` value will create a WDK secret at startup named `secretToken` with a value of `abc`