Create README.md

Author: steffenjacobs

README.md

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+# springboot-example
+A few examples with Springboot
+
+# 3 simple springboot applications:
+- test-backend: simple application which cannot persist data at all
+- test-backend-persistent: simple application which can persist its data into a storage.txt file
+- test-backend-db simple: application which can persist its data into a postgresql server at localhost:5432
+
+# HTTP-GET methods to interact with the applications in the browser
+Add an entry to cache with localhost:8080/createEntry
+show all entries: localhost:8080/entries
+clear entries: localhost:8080/clear
+
+persist entries to storage file / database: localhost:8080/persist
+load entries from storage file / dtabse: localhost:8080/load