Add search relevance plugin to meta (#248)

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

Author: gaiksaya

.gitignore

@@ -23,4 +23,5 @@
 /ml-commons/
 /geospatial/
 /opensearch-oci-object-storage/
+/search-relevance/
 .DS_Store

plugins/.meta

@@ -25,6 +25,7 @@
     "opensearch-system-templates": "git@github.com:opensearch-project/opensearch-system-templates.git",
     "opensearch-remote-metadata-sdk": "git@github.com:opensearch-project/opensearch-remote-metadata-sdk.git",
     "opensearch-learning-to-rank-base": "git@github.com:opensearch-project/opensearch-learning-to-rank-base.git",
-    "query-insights": "git@github.com:opensearch-project/query-insights.git"
+    "query-insights": "git@github.com:opensearch-project/query-insights.git",
+    "search-relevance": "git@github.com:opensearch-project/search-relevance.git"
   }
 }