add depends_on for all aws_eks_addon, add info about it to README.md

Author: and-babkin

README.md

@@ -80,6 +80,7 @@ You can find more about this project in Anton Babenko stream:
       - [Base project name](#base-project-name)
       - [Unique prefix of resource names](#unique-prefix-of-resource-names)
       - [Separators](#separators)
+      - [Depends_on](#depends_on)
       - [Resource names](#resource-names)
       - [Variable names](#variable-names)
       - [Output names](#output-names)
@@ -570,6 +571,18 @@ The `local.name` value is then used as a prefix for all `name` and `name_prefix`
 
 > Use `name_prefix` where possible
 
+#### Depends_on
+
+- When you need to add depends_on to resource or module you should add it in end and put empty line in front of it. Example:
+```
+resource "aws_eks_addon" "coredns" {
+  count = var.addon_create_coredns ? 1 : 0
+  ...
+
+  depends_on        = [module.eks]
+}
+```
+
 #### Resource names
 
 - The resource type should not be duplicated in the resource name (either partially or in full):