docs: add guides for how to use this wrapper

[odeke-em]

Important for usage

[odeke-em]

I added some example_test.go code in

gomongowrapper/example_test.go

Lines 15 to 88 in 4917210

	package mongowrapper_test
	import (
	"context"
	"log"
	"time"
	"github.com/mongodb/mongo-go-driver/bson"
	"github.com/opencensus-integrations/gomongowrapper"
	"contrib.go.opencensus.io/exporter/stackdriver"
	"go.opencensus.io/stats/view"
	"go.opencensus.io/trace"
	)
	func Example() {
	// Enabling the OpenCensus exporter.
	// Just using Stackdriver since it has both Tracing and Metrics
	// and is easy to whip up. Add your desired one here.
	sde, err := stackdriver.NewExporter(stackdriver.Options{
	ProjectID: "census-demos",
	MetricPrefix: "mongosample",
	})
	if err != nil {
	log.Fatalf("Failed to create Stackdriver exporter: %v", err)
	}
	view.RegisterExporter(sde)
	trace.RegisterExporter(sde)
	if err := mongowrapper.RegisterAllViews(); err != nil {
	log.Fatalf("Failed to register all views: %v\n", err)
	}
	defer func() {
	<-time.After(2 * time.Minute)
	}()
	// Start a span like your application would start one.
	ctx, span := trace.StartSpan(context.Background(), "Fetch", trace.WithSampler(trace.AlwaysSample()))
	defer span.End()
	// Now for the mongo connections, using the context
	// with the span in it for continuity.
	client, err := mongowrapper.NewClient("mongodb://localhost:27017")
	if err != nil {
	log.Fatalf("Failed to create the new client: %v", err)
	}
	if err := client.Connect(ctx); err != nil {
	log.Fatalf("Failed to open client connection: %v", err)
	}
	defer client.Disconnect(ctx)
	coll := client.Database("the_db").Collection("music")
	q := bson.M{"name": "Examples"}
	cur, err := coll.Find(ctx, q)
	if err != nil {
	log.Fatalf("Find error: %v", err)
	}
	for cur.Next(ctx) {
	elem := make(map[string]int)
	if err := cur.Decode(elem); err != nil {
	log.Printf("Decode error: %v", err)
	continue
	}
	log.Printf("Got result: %v\n", elem)
	}
	log.Print("Done iterating")
	_, err = coll.DeleteMany(ctx, q)
	if err != nil {
	log.Fatalf("Failed to delete: %v", err)
	}
	}

so perhaps that's sufficient? I paged @PikBot to help examine the example that I provided in https://opencensus.io/guides/integrations/mongodb/go_driver/