chore: Updated README.md

Author: Dzhuneyt

README.md

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+A terraform module that helps you to provision a CloudWatch event that listens for activity on a given CodeCommit repo's branch and automatically triggers a CodePipeline.
+
+More information is available on this guide:
+https://docs.aws.amazon.com/codepipeline/latest/userguide/triggering.html
+
+If you use this module, make sure [to set `PollForSourceChanges=false`](https://docs.aws.amazon.com/codepipeline/latest/userguide/reference-pipeline-structure.html), to avoid double triggering of the CodePipeline.
+
+Example usage:
+
+    module "cloudwatch_triggers_codepipeline" {
+      source = "./cloudwatch-codecommit-trigger-codepipeline"
+      aws_region = "eu-west-1"
+      branch_to_monitor = "develop"
+      codecommit_repo_arn = data.aws_codecommit_repository.my_repo.arn
+      codepipeline_arn = aws_codepipeline.codepipeline_develop.arn
+      tag = var.tag
+    
+      providers = {
+        aws = aws
+      }
+    }
+
+Make sure you point it to existing CodeCommit repos and CodePipeline instances:
+
+    data "aws_codecommit_repository" "my_repo" {
+      repository_name = "Repo-Name-Here"
+    }
+
+    resource "aws_codepipeline" "codepipeline_develop" {
+      # .. Definition here
+    }