Download specific rule as second parameter and accept third parameter to save with a custom name

[jabrena]

Download specific rule as second parameter and accept third parameter to save with a custom name

Evolve this example:

• jbang setup@jabrena init --cursor https://github.com/jabrena/cursor-rules-java

To accept:

• jbang setup@jabrena init --cursor https://github.com/jabrena/cursor-rules-java
• jbang setup@jabrena init --cursor https://github.com/jabrena/cursor-rules-java https://github.com/jabrena/cursor-rules-java/blob/main/.cursor/rules/170-java-documentation.md
• jbang setup@jabrena init --cursor https://github.com/jabrena/cursor-rules-java https://github.com/jabrena/cursor-rules-java/blob/main/.cursor/rules/170-java-documentation.md new-version-rule.md