Unify docs page for additional middleware

docs/guides/CORS.md

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-Crow Allows a developer to set CORS policies by using the `CORSHandler` middleware.<br><br>
-
-This middleware can be added to the app simply by defining a `#!cpp crow::App<crow::CORSHandler>`. This will use the default CORS rules globally<br><br>
-
-The CORS rules can be modified by first getting the middleware via `#!cpp auto& cors = app.get_middleware<crow::CORSHandler>();`. The rules can be set per URL prefix using `prefix()`, per blueprint using `blueprint()`, or globally via `global()`. These will return a `CORSRules` object which contains the actual rules for the prefix, blueprint, or application. For more details go [here](../../reference/structcrow_1_1_c_o_r_s_handler.html).
-
-`CORSRules` can  be modified using the methods `origin()`, `methods()`, `headers()`, `max_age()`, `allow_credentials()`, or `ignore()`. For more details on these methods and what default values they take go [here](../../reference/structcrow_1_1_c_o_r_s_rules.html).

docs/guides/included-middleware.md

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+Crow contains some middlewares that are ready to be used in your application.
+
+Make sure you understand how to enable and use [middleware](../middleware/).
+
+## Cookies
+Include: `crow/middlewares/cookie_parser.h` <br>
+Examples: `examples/middlewars/example_cookies.cpp`
+
+This middleware allows to read and write cookies by using `CookieParser`. Once enabled, it parses all incoming cookies.
+
+Cookies can be read and written with the middleware context. All cookie attributes can be changed as well.
+
+```c++
+auto& ctx = app.get_context<crow::CookieParser>(request);
+std::string value = ctx.get_cookie("key");
+ctx.set_cookie("key", "value")
+    .path("/")
+    .max_age(120);
+```
+
+**Note**: Make sure the CookieParser is listed before other middleware that relies on it
+
+## CORS
+Include: `crow/middlewares/cors.h` <br>
+Examples: `examples/middlewars/example_cors.cpp`
+
+This middleware allows to set CORS policies by using `CORSHandler`. Once enabled, it will apply the default CORS rules globally.
+
+The CORS rules can be modified by first getting the middleware via `#!cpp auto& cors = app.get_middleware<crow::CORSHandler>();`. The rules can be set per URL prefix using `prefix()`, per blueprint using `blueprint()`, or globally via `global()`. These will return a `CORSRules` object which contains the actual rules for the prefix, blueprint, or application. For more details go [here](../../reference/structcrow_1_1_c_o_r_s_handler.html).
+
+`CORSRules` can  be modified using the methods `origin()`, `methods()`, `headers()`, `max_age()`, `allow_credentials()`, or `ignore()`. For more details on these methods and what default values they take go [here](../../reference/structcrow_1_1_c_o_r_s_rules.html).
+
+```c++
+auto& cors = app.get_middleware<crow::CORSHandler>();
+cors
+  .global()
+    .headers("X-Custom-Header", "Upgrade-Insecure-Requests")
+    .methods("POST"_method, "GET"_method)
+  .prefix("/cors")
+    .origin("example.com");
+```