Update README

README.md

@@ -1,3 +1,29 @@
 # RichError
 
-A description of this package.
+## Info:
+
+A simple error protocol for structuring errors. Data can be passed along for use with debugging.
+
+## Example implementation:
+
+### Declaration:
+
+```
+struct NetworkRequestManagerError: RichError {
+    typealias ErrorKind = NetworkRequestManagerErrorKind
+
+    enum NetworkRequestManagerErrorKind {
+        case non200StatusCode
+        case nonJsonResponse
+    }
+
+    var kind: NetworkRequestManagerErrorKind
+    var data: [String: Any?]
+}
+```
+
+### Call site:
+
+```
+NetworkRequestManagerError(kind: .nonJsonResponse, data: ["request": request, "response": response, "data": data])
+```