Fix documentation. Rename .tf files according to the proposed standard

Author: Eugene Dementiev

ec2.tf renamed to main.tf

@@ -1,6 +1,4 @@
 resource "aws_launch_template" "LT" {
-  #  count = var.spot
-
   name = "${var.cluster_name}-spot"
 
   dynamic instance_market_options {

variables.tf

@@ -0,0 +1,49 @@
+# required variables
+#
+variable "cluster_name" {
+  description = "Name of the ECS cluster"
+}
+
+# optional variables
+#
+
+variable "ami" {
+  description = "Name of the AMI image to use"
+  default     = "amzn2-ami-ecs-hvm-*-x86_64-ebs"
+}
+
+variable "cpu_unlimited" {
+  description = "Whether or not enable t2/t3 cpu unlimited (if true, might incur additional charges)"
+  default     = false
+}
+
+variable "ec2_key_name" {
+  description = "EC2 key name to attach to newly created EC2 instances"
+  default     = ""
+}
+
+variable "instance_type" {
+  description = "EC2 instance type"
+  default     = "t3.micro"
+}
+
+variable "instances_desired" {
+  description = "Number of EC2 instances desired"
+  default     = 1
+}
+
+variable "security_groups" {
+  description = "list of security group names"
+  type        = "list"
+  default     = []
+}
+
+variable "spot" {
+  description = "Whether or not use Spot instances. Warning: most likely not suitable for production!"
+  default     = false
+}
+
+variable "vpc_name" {
+  description = "VPC name. If not set, will default to \"default\""
+  default     = ""
+}