Added serverless folder and files in it

backend/serverless/GO_API_service/.gitignore

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+# Serverless directories
+.serverless
+
+# golang output binary directory
+bin

backend/serverless/GO_API_service/GO_API/server.go

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+package main
+
+import (
+	"net/http"
+	"fmt"
+	"encoding/json"
+
+	"github.com/labstack/echo"
+ 	"github.com/labstack/echo/middleware"
+)
+
+type User struct {
+	Username string
+	FirstName string
+	LastName string
+}
+
+type Task struct {
+	Title string
+	Description string
+	UserOfTask User
+	Date string
+}
+
+func main() {
+	e := echo.New()
+ 
+ 	// Middleware
+ 	e.Use(middleware.Logger())
+ 	e.Use(middleware.Recover())
+ 
+ 	// CORS
+ 	e.Use(middleware.CORSWithConfig(middleware.CORSConfig{
+  		AllowOrigins: []string{"*"},
+  		AllowMethods: []string{echo.GET, echo.HEAD, echo.PUT, echo.PATCH, echo.POST, echo.DELETE},
+ 	}))
+
+ 	// Getting JSON as []byte
+ 	b, err := Handler()
+ 	if err != nil {
+ 		fmt.Println("error:", err)
+ 	}
+
+ 	//	Route => handler
+	e.GET("/", func(c echo.Context) error {
+		return c.String(http.StatusOK, string(b[:]))
+	})
+
+	// Server
+ 	e.Start(":1500")
+}
+
+func (u User) String() string {
+	return fmt.Sprintf("Username: %v\nFirst name: %v\nLast name: %v", u.Username, u.FirstName, u.LastName)
+}
+
+func (t Task) String() string {
+	return fmt.Sprintf("Title: %v\nDescription: %v\nUser: %v\nDate: %v", t.Title, t.Description, t.UserOfTask, t.Date)
+}
+
+func Handler() ([]byte, error) {
+ 	user := User {
+ 		Username: "emirbarucija",
+ 		FirstName: "Emir",
+ 		LastName: "Baručija",
+ 	}
+
+ 	task1 := Task {
+ 		Title: "First task",
+ 		Description: "This is my first task in GO language",
+ 		UserOfTask: user,
+ 		Date: "10.04.2018.",
+ 	}
+
+ 	task2 := Task {
+ 		Title: "Second task",
+ 		Description: "This is my second task in GO language",
+ 		UserOfTask: user,
+ 		Date: "14.04.2018.",
+ 	}
+
+ 	tasks := []Task{task1, task2}
+
+	b, err := json.Marshal(tasks)
+
+   return b, err
+}

backend/serverless/GO_API_service/Makefile

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+build:
+	go get github.com/aws/aws-lambda-go/lambda
+	env GOOS=windows go build -ldflags="-s -w" -o bin/GO_API GO_API/server.go

backend/serverless/GO_API_service/serverless.yml

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+# Welcome to Serverless!
+#
+# This file is the main config file for your service.
+# It's very minimal at this point and uses default values.
+# You can always add more config options for more control.
+# We've included some commented out config examples here.
+# Just uncomment any of them to get that config option.
+#
+# For full config options, check the docs:
+#    docs.serverless.com
+#
+# Happy Coding!
+
+service: GO_API_service
+
+# You can pin your service to only deploy with a specific Serverless version
+# Check out our docs for more details
+# frameworkVersion: "=X.X.X"
+
+provider:
+  name: aws
+  runtime: go1.x
+
+# you can overwrite defaults here
+#  stage: dev
+#  region: us-east-1
+
+# you can add statements to the Lambda function's IAM Role here
+#  iamRoleStatements:
+#    - Effect: "Allow"
+#      Action:
+#        - "s3:ListBucket"
+#      Resource: { "Fn::Join" : ["", ["arn:aws:s3:::", { "Ref" : "ServerlessDeploymentBucket" } ] ]  }
+#    - Effect: "Allow"
+#      Action:
+#        - "s3:PutObject"
+#      Resource:
+#        Fn::Join:
+#          - ""
+#          - - "arn:aws:s3:::"
+#            - "Ref" : "ServerlessDeploymentBucket"
+#            - "/*"
+
+# you can define service wide environment variables here
+#  environment:
+#    variable1: value1
+
+package:
+ exclude:
+   - ./**
+ include:
+   - ./bin/**
+
+functions:
+  GO_API:
+    handler: bin/GO_API
+    events:
+      - http:
+          path: all
+          method: get
+
+#    The following are a few example events you can configure
+#    NOTE: Please make sure to change your handler code to work with those events
+#    Check the event documentation for details
+# events:
+#    events:
+#      - http:
+#          path: users/create
+#          method: get
+#      - s3: ${env:BUCKET}
+#      - schedule: rate(10 minutes)
+#      - sns: greeter-topic
+#      - stream: arn:aws:dynamodb:region:XXXXXX:table/foo/stream/1970-01-01T00:00:00.000
+#      - alexaSkill: amzn1.ask.skill.xx-xx-xx-xx
+#      - alexaSmartHome: amzn1.ask.skill.xx-xx-xx-xx
+#      - iot:
+#          sql: "SELECT * FROM 'some_topic'"
+#      - cloudwatchEvent:
+#          event:
+#            source:
+#              - "aws.ec2"
+#            detail-type:
+#              - "EC2 Instance State-change Notification"
+#            detail:
+#              state:
+#                - pending
+#      - cloudwatchLog: '/aws/lambda/hello'
+#      - cognitoUserPool:
+#          pool: MyUserPool
+#          trigger: PreSignUp
+
+#    Define function environment variables here
+#    environment:
+#      variable2: value2
+
+# you can add CloudFormation resource templates here
+#resources:
+#  Resources:
+#    NewResource:
+#      Type: AWS::S3::Bucket
+#      Properties:
+#        BucketName: my-new-bucket
+#  Outputs:
+#     NewOutput:
+#       Description: "Description for the output"
+#       Value: "Some output value"