added Readme file and change ebs size static to dynamic

Author: easyawslearn

ebs-with-userdata/README.md

@@ -0,0 +1,25 @@
+# aws-instance-first-script
+
+A Terraform module for creating AWS EC2 instance with userdata for creating EBS.
+
+## Usage
+
+```hcl
+module "ec2_instance" {
+  source     = "git::https://github.com/easyawslearn/Terraform-Tutorial.git/ebc-with-userdata"
+
+  region    = "us-west-2"
+  key-name  = "ec2-demo"
+  instance_type = "t2.micro"
+  ebs_size = "20"
+}
+```
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|:----:|:-----:|:-----:|
+| region | AWS region | string | us-east-1 | yes |
+| key-name | ec2 access key name | string | ec2-demo | yes |
+| instance_type | ec2 instance_type | string | t2.micro | yes |
+| ebs_size | EBS volume size | string | 20 | yes |

ebs-with-userdata/ebs_volume.tf

@@ -1,6 +1,6 @@
 resource "aws_ebs_volume" "ebs_volume" {
   availability_zone = "us-east-1a"
-  size              = 20
+  size              = var.ebs_size
   type              = "gp2"
 
   tags = {

ebs-with-userdata/variables.tf

@@ -19,6 +19,12 @@ variable "device_name" {
   type    = "string"
   default = "/dev/xvdh"
 }
+
+variable "ebs_size" {
+  type    = "string"
+  default = "20"
+}
+
 variable "key_name" {
   type    = "string"
   default = "ec2-demo"