add README.md to each example directory with usage instructions

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+# Example: Plain Ruby Script
+
+Uses RCM directly from a Ruby script — no Rake, no Bundler required.
+
+## Usage
+
+```sh
+# Dry run — show what would change, make no changes
+ruby config.rb --dry
+
+# Verbose output
+ruby config.rb --debug
+
+# Apply configuration
+ruby config.rb
+```
+
+## What it does
+
+- Creates `/tmp/example/hello.txt` with static content (parent directory created automatically)
+- Ensures the line `127.0.0.1 localhost` is present in `/tmp/example/hosts.txt`
+- Creates `/tmp/example/greeting.txt` from an inline ERB template