docs: add about page to summarize scope of this library

Author: jankapunkt

docs/docs/about.rst

@@ -0,0 +1,42 @@
+========================
+About Node OAuth2 Server
+========================
+
+Please read this section carefully to understand the purpose and scope of the Node OAuth2 Server library.
+
+Scope
+=====
+
+The scope of this library is to provide a headless implementation of an OAuth2 server that can be used in a variety of applications.
+It is designed to be flexible and extensible, allowing developers to implement their own models and customize the behavior of the server.
+
+
+Headless
+========
+
+By headless we mean that the library does not provide a user interface or any specific implementation details for handling user interactions.
+It is purely a backend library that can be integrated into any Node.js application or framework.
+
+The core library is also designed to be framework-agnostic, meaning it does not depend on any specific web framework like Express or Koa.
+For these frameworks, we provide separate adapter libraries that can be used to integrate the OAuth2 server into your application.
+
+Workflows
+=========
+
+The library intends to cover the core OAuth2 workflows, including:
+- Authorization Code Grant
+- Client Credentials Grant
+- Password Grant
+- Refresh Token Grant
+
+While we provide documentation and examples for these workflows,
+it is crucial for developers to understand the OAuth2 specification and how to implement these workflows correctly in their applications.
+This is especially important for security reasons, as OAuth2 is a complex protocol with many potential pitfalls.
+
+We do provide links to standards and readings that can help developers understand the OAuth2 specification and how to implement it securely.
+
+Examples
+========
+
+We provide generic examples which you can use as foundation.
+However, please make sure you understand the OAuth2 specification and how to implement it correctly in your application.

docs/index.rst

@@ -55,6 +55,7 @@ Contents
  :maxdepth: 1
  :caption: User Documentation
 
+ docs/about
  docs/getting-started
  docs/adapters