✨ Add docs for HTTP Basic Auth and tests (#177)

docs/tutorial/security/http-basic-auth.md

@@ -0,0 +1,40 @@
+For the simplest cases, you can use HTTP Basic Auth.
+
+In HTTP Basic Auth, the application expects a header that contains a username and a password.
+
+If it doesn't receive it, it returns an HTTP 401 "Unauthorized" error.
+
+And returns a header `WWW-Authenticate` with a value of `Basic`, and an optional `realm` parameter.
+
+That tells the browser to show the integrated prompt for a username and password.
+
+Then, when you type that username and password, the browser sends them in the header automatically.
+
+## Simple HTTP Basic Auth
+
+* Import `HTTPBAsic` and `HTTPBasicCredentials`.
+* Create a "`security` scheme" using `HTTPBAsic`.
+* Use that `security` with a dependency in your *path operation*.
+* It returns an object of type `HTTPBasicCredentials`:
+    * It contains the `username` and `password` sent.
+
+
+```Python hl_lines="2 6 10"
+{!./src/security/tutorial006.py!}
+```
+
+When you try to open the URL for the first time (or click the "Execute" button in the docs) the browser will ask you for your username and password:
+
+<img src="/img/tutorial/security/image12.png">
+
+## Check the username
+
+Here's a more complete example.
+
+Use a dependency to check if the username and password are correct.
+
+If the credentials are incorrect, return an `HTTPException` with a status code 401 (the same returned when no credentials are provided) and add the header `WWW-Authenticate` to make the browser show the login prompt again:
+
+```Python hl_lines="10 11 12 13 14 15 16 17 21"
+{!./src/security/tutorial007.py!}
+```