added jdk 8 instructions for macOS

added necessary commands and download links
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@ -49,6 +49,27 @@ On Mac OSX and Linux, use `./gradlew` instead of `gradlew`.
If you have errors with a package missing please make sure you have setup your environment, and are using Oracle JDK 8.
To check which java you are using do
`java -version` in a command prompt or terminal.
If you are using Oracle JDK 8+ it will not work because the Java distributions above JDK 8 using may not have the needed javax classes.
Oracle JDK 8 download: https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html
#### macOS guide
In order to get JDK 8, run the following command:
`% /usr/libexec/java_home -V`
If you see something like
`% 1.8.0_202, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home`
in the list then you've got JDK 8 installed.
In order to get JDK 8 running in the **current terminal window** you will have to run this command:
`% export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)`
You will have to compile the file in the same terminal window.
#### Windows 10 guide (currently working on it)
Setting up the Environment:
```