docs: More samples.

Change-Id: Ibcab3b04ae1650cd213a5a0915b7c6056a6a6964

examples/go/main.go

@@ -0,0 +1,10 @@
+package main
+
+import "go.uber.org/zap"
+
+func main() {
+	logger, _ := zap.NewDevelopment()
+	defer logger.Sync()
+
+	logger.Info("This is an example Go program.", zap.String("exampleString", "yes"), zap.Bool("example", true))
+}