Add prometheus requests processed and request latencies metric gathering wrapper

README.md

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+# Prometheus
+
+Wrappers are a form of middleware that can be used with go-micro services. They can wrap both the Client and Server handlers.
+This plugin implements the HandlerWrapper interface to provide automatic prometheus metric handling
+for each microservice method execution time and operation count for success and failed cases.
+
+This handler will export two metrics to prometheus:
+* **go_micro_requests_total**. How many go-miro requests processed, partitioned by method and status.
+* **go_micro_request_durations_microseconds**. Service method request latencies in microseconds, partitioned by method.
+
+# Usage
+
+When creating your service, add the wrapper like so.
+
+```go
+    service := micro.NewService(
+        micro.Name("service name"),
+	micro.Version("latest"),
+	micro.WrapHandler(prometheus.NewHandlerWrapper()),
+    )
+
+    service.Init()
+```