fix: fix README

examples/DisposableTokens/README.md

@@ -1,3 +1,15 @@
 <img src="https://docs.momentohq.com/img/logo.svg" alt="logo" width="400"/>
 
 # Disposable Tokens Example
+
+This example program demonstrates how to generate disposable Momento auth tokens.
+
+# Usage
+
+The program assumes that your Momento auth token is available in the `MOMENTO_AUTH_TOKEN` environment variable:
+
+```bash
+MOMENTO_AUTH_TOKEN=<YOUR_AUTH_TOKEN> dotnet run
+```
+
+The example generates a disposable expiring auth token using the enumerated permissions and expiry defined in the program and prints its attributes to the console.