Add cleanup script README (#98)

Author: Veetaha

cleanup/README.md

@@ -0,0 +1,42 @@
+# Cleanup
+
+If you'd like to clean up scripts to clean up your environment from resources deployed by Elastio, then download and run the `aws-gc` binary developed by Elastio as shown below.
+
+It discovers all resources with `elastio:resource` tag or with `elastio` in their name, shows the list of all of them, asks you to confirm by typing `yes`, and starts the deletion.
+
+Run one of the following scripts in AWS Cloudshell or locally on your own machine. Choose the script depending on your OS.
+
+## Linux
+
+```bash
+curl -fLS "https://dl.cloudsmith.io/public/elastio/public/raw/versions/latest/aws-gc_$(uname -m | sed "s/arm64/aarch64/")-unknown-linux-musl.tar.xz" | sudo tar -xJf - -C /usr/local/bin
+
+aws-gc destroy --tag elastio:resource=true --id-pattern elastio
+```
+
+## Windows
+
+```bash
+Invoke-WebRequest "https://dl.cloudsmith.io/public/elastio/public/raw/versions/latest/aws-gc_x86_64-pc-windows-msvc.zip" -OutFile "aws-gc.zip";
+Expand-Archive -Force "aws-gc.zip";
+Move-Item -Force "./aws-gc/aws-gc.exe" "./aws-gc.exe";
+Remove-Item -Force "./aws-gc", "./aws-gc.zip";
+
+./aws-gc.exe destroy --tag elastio:resource=true --id-pattern elastio
+```
+
+## MacOS
+
+```bash
+curl -fLS "https://dl.cloudsmith.io/public/elastio/public/raw/versions/latest/aws-gc_$(uname -m | sed "s/arm64/aarch64/")-apple-darwin.tar.xz" | sudo tar -xJf - -C /usr/local/bin
+
+aws-gc destroy --tag elastio:resource=true --id-pattern elastio
+```
+
+## Troubleshooting
+
+### Premature Cloudshell Session Termination
+
+If AWS Cloudshell is terminating before `aws-gc` completes, then try restarting it again. The cleanup script is idempotent, so if it's aborted in the middle the deletion progress won't be undone. You can also limit the regions where it discovers the resources with the `--regions` parameter to speed up `aws-gc` a bit.
+
+As a fallback try running the cleanup from your local machine.