chore(sdk-platform-java): restore GEMINI.md and DEVELOPMENT.md #528

Job	Run time
filter	1m 0s
downstream-compatibility-spring-generator	12m 39s
downstream-compatibility (java-pubsublite)	3m 19s
downstream-compatibility (java-firestore)	3m 31s
downstream-compatibility (java-bigtable)	7m 46s
downstream-compatibility (java-bigquery)	4m 13s
downstream-compatibility (java-pubsub)	6h 5m 0s
downstream-compatibility (java-storage)	5m 32s
downstream-compatibility (java-spanner-jdbc)	3m 45s
downstream-compatibility (java-spanner)	5m 41s
downstream-compatibility (java-storage-nio)	3m 17s
	6h 55m 43s

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