Circuit breaker markdown

stability/circuit_breaker.md

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+# Circuit Breaker Pattern
+
+The [circuit breaker design pattern](https://en.wikipedia.org/wiki/Circuit_breaker_design_pattern) is used to detect failures and encapsulates logic of preventing a failure to reoccur constantly.
+
+# Implementation and Example
+
+An example of implementation and usage can be found in [circuitbreaker.go](circuitbreaker.go).