GITBOOK-21: Add basic auth page

SUMMARY.md

@@ -32,6 +32,7 @@
   * [Kraft mode + multiple brokers](configuration/configuration/complex-configuration-examples/kraft-mode-+-multiple-brokers.md)
 * [SSL](configuration/ssl.md)
 * [Authentication](configuration/authentication/README.md)
+  * [Basic Authentication](configuration/authentication/basic-authentication.md)
   * [OAuth2](configuration/authentication/oauth2.md)
   * [AWS IAM](configuration/authentication/aws-iam.md)
   * [SSO Guide](configuration/authentication/sso-guide.md)

configuration/authentication/basic-authentication.md

@@ -0,0 +1,15 @@
+---
+description: Basic username+password authentication
+---
+
+# Basic Authentication
+
+In order to enable basic username+passworda authentication add these properties:
+
+```
+      AUTH_TYPE: "LOGIN_FORM"
+      SPRING_SECURITY_USER_NAME: admin
+      SPRING_SECURITY_USER_PASSWORD: pass
+```
+
+Please note that basic auth is not compatible with neither any other auth method nor RBAC.