adding README file and testing env. new variable

Author: Miqueasher

terraform/python/ec2/default/README.md

@@ -0,0 +1,8 @@
+# CLOUDWATCH AGENT CONFIG.
+This cloudwatch-agent.json file is a version of the amazon-cloudwatch-agent fitted to the needs of the python sample app using custom metrics.
+
+It handles the custom metrics through the addition of the otlp ports:
+      "otlp": {
+        "grpc_endpoint": "0.0.0.0:4317",
+        "http_endpoint": "0.0.0.0:4318"
+      }

terraform/python/ec2/default/main.tf

@@ -178,7 +178,7 @@ resource "null_resource" "main_service_setup" {
       export OTEL_EXPORTER_OTLP_TRACES_PROTOCOL=grpc
       export OTEL_EXPORTER_OTLP_METRICS_PROTOCOL=grpc
       export OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=localhost:4317
-      export OTEL_EXPORTER_OTLP_INSECURE=true
+      export OTEL_EXPORTER_OTLP_METRICS_INSECURE=true
       export OTEL_TRACES_SAMPLER=always_on
       export OTEL_RESOURCE_ATTRIBUTES="service.name=python-sample-application-${var.test_id},deployment.environment.name=ec2:default"
       export AWS_REGION='${var.aws_region}'