updated readme.md and updated function to support multi database

Author: Amit

Readme.md

@@ -28,9 +28,60 @@ func main() {
         Password: "your_mongodb_password",
         Host:     "localhost",
         Port:     "your_mongodb_port",
-        DbName:   "your_db_name",
     }
 
     mongodb_client.ConnectDb(&mongodbConfig)
 }
-```
+```
+
+### Get database by name
+
+```go
+func GetDb() {
+    // this function returns *mongo.Database
+    database := mongodb_client.GetDb("your_database_name")
+}
+```
+
+### Create collections
+
+```go
+// Create Collections
+func CreateCollections(config *config.Config) {
+	bgCtx := context.Background()
+	ctx, cancel := context.WithTimeout(bgCtx, 5*time.Second)
+	defer cancel()
+
+	collections := []string{
+		// list of your collections which you want to create under a database
+	}
+
+	// List existing collections
+	existingCollections, err := mongodb_client.GetDb().ListCollectionNames(ctx, bson.D{})
+	log.Printf("✅ List of Collections: %s", existingCollections)
+
+	if err != nil {
+		log.Fatalf("❌ Failed to list collections in DB %s: %v", config.ClientDbName, err)
+	}
+
+	existingMap := make(map[string]bool)
+
+	for _, name := range existingCollections {
+		existingMap[name] = true
+	}
+
+	log.Printf("✅ Collections already present: %v", existingMap)
+
+	// Create only missing collections
+	for _, collection := range collections {
+		if !existingMap[collection] {
+			if err := mongodb_client.GetDb("your_database_name").CreateCollection(ctx, collection); err != nil {
+				log.Fatalf("❌ Failed to create collection %s: %v", collection, err)
+			}
+
+			log.Printf("✅ Created collection: %s", collection)
+		}
+	}
+}
+
+```

mongodb_client/config.go

@@ -1,6 +1,6 @@
 package mongodb_client
 
-type MongodbConfigV2 struct {
+type MongodbConfig struct {
 	Username string
 	Password string
 	Host     string

mongodb_client/mongodb-client.go

@@ -24,7 +24,7 @@ func GetDb(dbName string) *mongo.Database {
 }
 
 // Connect Mongodb function will initialize and connect to mongodb based on the URL, Port and Host passed via config
-func ConnectDb(config *MongodbConfigV2) {
+func ConnectDb(config *MongodbConfig) {
 	// Get MongoDB URI from environment variable if set, otherwise use default
 	mongoDbUrl := fmt.Sprintf("mongodb://%s:%s@%s:%s", config.Username, config.Password, config.Host, config.Port)