Adding throttling pattern

throttling/README.md

@@ -0,0 +1,16 @@
+---
+layout: pattern
+title: Throttling pattern
+folder: throttling
+permalink: /patterns/throttling/
+tags:
+ - Java
+ - Difficulty-Beginner
+ - Throttling
+---
+
+## Applicability
+The Throttling pattern should be used:
+
+* when a service access needs to be restricted to not have high impacts on the performance of the service.
+* when multiple tenants are consuming the same resources and restriction has to be made according to the usage per tenant.