Added Linux and MacOS configs

Author: mapoart

java.darwin.nexss.config.js

@@ -0,0 +1,15 @@
+let languageConfig = Object.assign(
+  {},
+  require(`../config.${process.platform}`)
+);
+
+languageConfig.compilers = {
+  java: {
+    install: "brew cask install java",
+    command: "javac",
+    args: `<file> -Xlint:unchecked -cp .;lib/*;src/lib/* & java -Dfile.encoding="UTF-8" -cp .;lib/*;src/lib/* <fileNoExt>`,
+    help: ``,
+  },
+};
+
+module.exports = languageConfig;

java.linux.nexss.config.js

@@ -0,0 +1,21 @@
+let languageConfig = Object.assign(
+  {},
+  require(`../config.${process.platform}`)
+);
+
+languageConfig.compilers = {
+  java8: {
+    install: "apt install openjdk-8-jdk",
+    command: "javac",
+    args: `<file> -Xlint:unchecked -cp .;lib/*;src/lib/* & java -Dfile.encoding="UTF-8" -cp .;lib/*;src/lib/* <fileNoExt>`,
+    help: ``,
+  },
+  java13: {
+    install: "apt install openjdk-13-jdk",
+    command: "javac",
+    args: `<file> -Xlint:unchecked -cp .;lib/*;src/lib/* & java -cp .;lib/*;src/lib/* <fileNoExt>`,
+    help: ``,
+  },
+};
+
+module.exports = languageConfig;