New Resource: Luqum

This helps devs to parse Lucene query expressions and converting them into structured Elasticsearch DSL queries.

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@marcelscruz

Summary by cubic

Added Luqum to the resources list to help developers parse Lucene queries and convert them into Elasticsearch DSL. Included categories and keywords for better discovery and organization.

^{Written for commit 77f96a0. Summary will update automatically on new commits.}