docs: add small readme's to every submodule

modules/budget_alerts/README.MD

@@ -1,5 +1,7 @@
 # Standartized and simplified budget alert
 
+This module allows you to create a budget alert with a single line of code. It also allows you to specify the percentage of the budget threshold to notify. With default values, notifications will be sent at 100%, 150%, and 200% of the budget `limit_amount`.
+
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 ## Requirements
 

modules/cost_anomaly_detection/README.MD

@@ -1,5 +1,6 @@
 # Cost anomaly detection alert
 
+This module creates a cost anomaly detection alert with default values. You need to specify the `threshold` value, which is the dollar value that triggers a notification if the threshold is exceeded.
 
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 ## Requirements

modules/eventbridge/README.MD

@@ -1,6 +1,8 @@
 # Event brige alerts:
 GuardDuty and AWS health events.
 
+This alert creates two CloudWatch event rules that send notifications to an SNS topic when GuardDuty or AWS Health events are triggered.
+
 
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 ## Requirements

modules/iam/README.MD

@@ -1,6 +1,6 @@
 # Iam for Chatbot
-Automated creation of IAM resources for AWS Chatbot.
 
+Automated creation of IAM resources for AWS Chatbot.
 
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 ## Requirements

modules/reservations/README.MD

@@ -1,8 +1,10 @@
 # Reservations utilization alert
 
+This module creates a budget alert for Reserved Instance utilization. It will send notifications when utilization falls below a specified threshold.
+
 Required only 2 values:
 - `threshold` - percentage of utilization
-- `subscriber_sns_topic_arns` - sns topic for chatbot
+- `subscriber_sns_topic_arns` or `subscriber_email_addresses` 
 
 
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modules/savings_plans/README.MD

@@ -1,8 +1,10 @@
 # Savings plans utilization alert
 
+This module creates a budget alert for Savings Plans utilization. It will send notifications when utilization falls below a specified threshold.
+
 Required only 2 values:
 - `threshold` - percentage of utilization
-- `subscriber_sns_topic_arns` - sns topic for chatbot
+- `subscriber_sns_topic_arns` or `subscriber_email_addresses` 
 
 
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modules/slack_workspace/README.MD

@@ -1,5 +1,6 @@
 # Slack workspace configuration
 
+This module gives you a better way to configure your Slack workspace with AWS Chatbot. It allows you to configure multiple channels and SNS topics, as well as IAM roles and logging levels.
 
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 ## Requirements