add java useful tools and library

Author: anishmanandhar

docs/java/tools.md

@@ -0,0 +1,20 @@
+---
+id: tools
+title: Tools and Libraries
+sidebar_label: Tools and Libraries
+---
+
+### Formatters
+
+* [Google java Style](https://github.com/google/google-java-format)
+
+### Dependency Management
+
+* [Gradle](https://gradle.org) (*recommended*)
+* [Maven](https://maven.apache.org)
+
+### Testing
+
+* [JUnit 5](https://junit.org/junit5/)
+* [Mock Tool](https://github.com/mockito/mockito)
+* [Code Coverage](https://github.com/jacoco/jacoco)

sidebars.js

@@ -30,8 +30,10 @@ module.exports =
           "java/interfaces",
           "java/variables",
           "java/functions"
-        ]
+        ], 
       },
+      "java/logging",
+      "java/tools",
       {
         "type": "category",
         "label": "Effective Java",