Add javadoc link to WPILib docs and oracle java docs. (#40)

* Added javadoc link to WPILib docs and oracle java docs.

* Update javadocs link to java17

* Update build.gradle

* Fix variable to integer.

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Co-authored-by: thenetworkgrinch <thenetworkgrinch@users.noreply.github.com>

build.gradle

@@ -24,6 +24,7 @@ java {
   sourceCompatibility = JavaVersion.VERSION_17
   targetCompatibility = JavaVersion.VERSION_17
 }
+var javaVersion = "17"
 
 // Apply C++ configuration
 apply from: 'config.gradle'
@@ -45,6 +46,13 @@ dependencies {
     implementation 'edu.wpi.first.thirdparty.frc2024.opencv:opencv-java:4.8.0-4'
 }
 
+// Setup Javadocs to link back to WPILib docs
+javadoc {
+    options {
+        links "https://docs.oracle.com/en/java/javase/$javaVersion/docs/api/", 'https://github.wpilib.org/allwpilib/docs/release/java/'
+    }
+}
+
 // Set up exports properly
 nativeUtils {
   exportsConfigs {