docs(readme): collapse available methods

Author: DerStimmler

README.md

@@ -76,7 +76,8 @@ app.MapGet("/books", (BookService service) =>
 
 ### Available methods
 
-These methods are available in sync and async variants:
+<details>
+  <summary>**Click here** to show all available methods</summary>
 
 | Method                                | Short Description                                                            |
 |---------------------------------------|------------------------------------------------------------------------------|
@@ -106,6 +107,9 @@ These methods are available in sync and async variants:
 | `.ToFileStreamHttpResult<Stream,E>()` | Returns `FileStreamHttpResult` or custom error                               |
 | `.ToContentHttpResult<string>()`      | Returns `ContentHttpResult` or `ProblemHttpResult`                           |
 | `.ToContentHttpResult<string,E>()`    | Returns `ContentHttpResult` or custom error                                  |
+</details>
+
+All methods are available in sync and async variants.
 
 ### Default mapping