Updated readme

README.md

@@ -2,4 +2,14 @@
 
 Upload a file. Share the URL/link. Download the file.
 
-Simple as that.
+Simple as that.
+
+## Setup development environment
+
+Requirements:
+- Java JDK 21
+- Gradle 8.5
+
+1. Update `spring.profiles.active` in `application.properties` to `development`
+2. Start external Backend and Database
+3. Run `./gradlew bootRun ` in the root directory

build.gradle

@@ -9,6 +9,7 @@ version = '0.0.2'
 
 java {
 	sourceCompatibility = '21'
+	targetCompatibility = '21'
 }
 
 configurations {