Add Exclusion list file format

Exclusion-list-file-format.md

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+The `.cdm` file is used to store domain exclusions for the Cookie Dialog Monster extension. This file should follow a specific format to ensure proper functionality.
+
+## Blank lines
+
+The file must not contain any **blank lines**.
+
+## Domain lines
+
+Each line should contain a single domain in the following formats:
+
+- For URLs like `https://another.example.com`, use `another.example.com`
+- For URLs like `https://example.com`, use `example.com`
+- For URLs like `https://www.example.com`, use `example.com`
+
+## No spaces
+
+Ensure there are **no spaces** before, between or after the domain name.
+
+## Valid `.cdm` file example
+
+```
+example-1.com
+example-2.com
+example-3.com
+example-4.com
+example-5.com
+another.example-1.com
+another.example-2.com
+another.example-3.com
+another.example-4.com
+another.example-5.com
+```