added pub and private keys files

vars.tf

@@ -13,6 +13,19 @@ variable "public-network-name" {
 variable "keypair-name" {
   default = "os-gen-keypair"
 }
+
+variable "ssh_public_key" {
+  description = "Path to file containing public key"
+  default =
+    "~/.ssh/id_rsa.pub"
+}
+
+variable "ssh_private_key" {
+  description = "Path to file containing private key"
+  default = 
+    "~/.ssh/id_rsa"
+}
+
   
 variable "enable-dhcp" {
   description = "whether dhcp in enabled. defualt is true"