Add README.md and tutorial walkthrough for script-only tutorials

Author: mwunderl

tuts/151-lambda-layers/README.md

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+# Lambda Layers
+
+An AWS CLI tutorial that demonstrates Iam operations.
+
+## Running
+
+```bash
+bash lambda-layers.sh
+```
+
+To auto-run with cleanup:
+
+```bash
+echo 'y' | bash lambda-layers.sh
+```
+
+## What it does
+
+1. Creating a layer
+2. Creating function that uses the layer
+3. Invoking function
+4. Listing layers
+
+## Resources created
+
+- Function
+- Role
+
+The script prompts you to clean up resources when it finishes.
+
+## Cost
+
+Free tier eligible for most operations. Clean up resources after use to avoid charges.
+
+## Related docs
+
+- [AWS CLI iam reference](https://docs.aws.amazon.com/cli/latest/reference/iam/index.html)
+- [AWS CLI lambda reference](https://docs.aws.amazon.com/cli/latest/reference/lambda/index.html)
+

tuts/151-lambda-layers/lambda-layers.md

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+# Lambda Layers
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Creating a layer
+
+The script handles this step automatically. See `lambda-layers.sh` for the exact CLI commands.
+
+## Step 2: Creating function that uses the layer
+
+The script handles this step automatically. See `lambda-layers.sh` for the exact CLI commands.
+
+## Step 3: Invoking function
+
+The script handles this step automatically. See `lambda-layers.sh` for the exact CLI commands.
+
+## Step 4: Listing layers
+
+The script handles this step automatically. See `lambda-layers.sh` for the exact CLI commands.
+
+## Cleanup
+
+The script prompts you to clean up all created resources. If you need to clean up manually, check the script log for the resource names that were created.
+

tuts/155-ec2-snapshots/README.md

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+# Ec2 Snapshots
+
+An AWS CLI tutorial that demonstrates Ec2 operations.
+
+## Running
+
+```bash
+bash ec2-snapshots.sh
+```
+
+To auto-run with cleanup:
+
+```bash
+echo 'y' | bash ec2-snapshots.sh
+```
+
+## What it does
+
+1. Creating a volume
+2. Creating a snapshot
+3. Describing snapshot
+4. Copying snapshot (same region)
+5. Listing snapshots
+
+## Resources created
+
+- Snapshot
+- Volume
+
+The script prompts you to clean up resources when it finishes.
+
+## Cost
+
+Free tier eligible for most operations. Clean up resources after use to avoid charges.
+
+## Related docs
+
+- [AWS CLI ec2 reference](https://docs.aws.amazon.com/cli/latest/reference/ec2/index.html)
+

tuts/155-ec2-snapshots/ec2-snapshots.md

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+# Ec2 Snapshots
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Creating a volume
+
+The script handles this step automatically. See `ec2-snapshots.sh` for the exact CLI commands.
+
+## Step 2: Creating a snapshot
+
+The script handles this step automatically. See `ec2-snapshots.sh` for the exact CLI commands.
+
+## Step 3: Describing snapshot
+
+The script handles this step automatically. See `ec2-snapshots.sh` for the exact CLI commands.
+
+## Step 4: Copying snapshot (same region)
+
+The script handles this step automatically. See `ec2-snapshots.sh` for the exact CLI commands.
+
+## Step 5: Listing snapshots
+
+The script handles this step automatically. See `ec2-snapshots.sh` for the exact CLI commands.
+
+## Cleanup
+
+The script prompts you to clean up all created resources. If you need to clean up manually, check the script log for the resource names that were created.
+