chore: update readme with token generation (#22)

README.md

@@ -3,16 +3,21 @@
 - [Homebrew](https://brew.sh/)
 
 ## Install
-```bash
+```
 brew tap momentohq/tap
 brew install momento-cli
 ```
+## Sign up
+```
+momento account signup --email <TYPE_YOUR_EMAIL_HERE>
+```
+This generates an access token and sends it to the email provided. This token uniquely identifies cache interactions. The token should be treated like a sensitive password and all essential care must be taken to ensure its secrecy. We recommend that you store this token in a secret vault like AWS Secrets Manager.
 
 ## Configure
 ```
 momento configure
 ```
-This will prompt you for your Momento Auth Token, and save it to be reused. Need a token? Send us an email at [email protected].
+This will prompt you for your Momento Auth Token, and save it to be reused.
 
 ## Use CLI
 ```