update README

Author: Project516

.idea/compiler.xml

@@ -138,7 +138,6 @@ The game automatically tracks high scores (games won with the fewest guesses). H
 
 ```
 sdk install java 25-tem
-sdk install gradle
 ```
 
 Alternatively, install Eclipse Temurin JDK directly from https://adoptium.net/
@@ -147,13 +146,7 @@ Alternatively, install Eclipse Temurin JDK directly from https://adoptium.net/
 
 From the project root:
 ```
-gradle build
-```
-
-### Running Tests
-
-```
-gradle test
+./gradlew build
 ```
 
 ### Creating Release Archives

.idea/gradle.xml

@@ -11,6 +11,8 @@ plugins {
 repositories {
     // Use Maven Central for resolving dependencies.
     mavenCentral()
+    gradlePluginPortal()
+    google()
 }
 
 dependencies {