Devops exercises : Adding 2 Terraform questions on import (#149)

* Add terraform import question
* Add how to use terraform import question
* Add example on how to use terraform import question

README.md

@@ -5583,6 +5583,35 @@ The Terraform Registry provides a centralized location for official and communit
   It is also common in the community to use a tool called <code>terragrunt</code> to explicitly inject variables between modules.
 </b></details>
 
+<details>
+<summary>What is Terraform import?</summary><br><b>
+
+Terraform import is used to import existing infrastucture. It allows you to bring resources created by some other means (eg. manually launched cloud resources) and bring it under Terraform management. 
+</b></details>
+
+<details>
+<summary>How do you import existing resource using Terraform import?</summary><br><b>
+
+1. Identify which resource you want to import.
+2. Write terraform code matching configuration of that resource.
+3. Run terraform command <code>terraform import RESOURCE ID</code><br>
+
+eg. Let's say you want to import an aws instance. Then you'll perform following:
+1. Identify that aws instance in console
+2. Refer to it's configuration and write Terraform code which will look something like:
+```
+resource "aws_instance" "tf_aws_instance" {
+  ami           = data.aws_ami.ubuntu.id
+  instance_type = "t3.micro"
+
+  tags = {
+    Name = "import-me"
+  }
+}
+```
+3. Run terraform command <code>terraform import aws_instance.tf_aws_instance i-12345678</code>
+</b></details>
+
 ## Containers
 
 ### Containers Exercises