readme: expand the scope and minor additions

The following have been added to the README:
- Build requirements
- Disclaimer
- Goals and non-goals
- License

README.md

@@ -1,7 +1,29 @@
 # Dumb JOSE
 
 Insecure library for a set of insecure formats.
+It aims to provide inflexible verification for cases where you unfortunately can't avoid touching JWT.
+
+## Requirements
+
+* Go *>= 1.17*
+
+## Disclaimer
+
+Don't use JWT. You don't need me to tell you about it.
+Likewise, you shouldn't need me to tell you that you shouldn't use this library.
+
+## Goals
+
+* Just enough JWT for people to speak commonly encountered OAuth 2.0 and alike.
+* Don't allow for any of the sharp edges.
+* Allow for binding domain parameters as much as possible to the public keys.
+
+## Non-Goals
+
+* Signing capabilities.
+* Anything that has to do with encryption or key exchange.
+* Be 100% compliant with the standard.
 
 ## License
 
-This repository is licensed under the `BSD-3-Clause`.
+This repository is licensed under the `BSD-3-Clause`. Refer to [LICENSE](https://github.com/aydinmercan/dumb-jose/blob/main/LICENSE) for more information.