Developer note (#233)

Developer note

Author: JaneEugenia

DEVNOTE.md

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+# UTBot Java Developer Guide
+ 
+ Here are the steps for you to jump into UTBot Java.
+ 
+## Install UTBot Java from source
+1. Clone UTBot Java repository via [Git](https://github.com/UnitTestBot/UTBotJava.git)
+2. Open project in IDE
+
+![image](https://user-images.githubusercontent.com/106974353/174806216-9d4969b4-51fb-4531-a6d0-94e3734a437a.png)
+
+*don\`t forget to check your Project SDK and Gradle SDK are of 1.8 Java version.
+
+![image](https://user-images.githubusercontent.com/106974353/174812758-fcbabb5b-0411-48d7-aefe-6d69873185e3.png)
+![image](https://user-images.githubusercontent.com/106974353/174806632-ed796fb7-57dd-44b5-b499-e9eeb0436f15.png)
+
+3. Open Gradle tool window
+4. Launch Task utbot > Tasks > build > assemble
+
+![image](https://user-images.githubusercontent.com/106974353/174807962-18c648fd-b67d-4556-90df-eee690abe6e2.png)
+
+5. Wait for the build to be completed
+
+Done! You\`re awesome and ready for digging the code. 😃
+
+ 
+## Development of UTBot Java with IntelliJ IDEA
+
+The majority of the code is written in Kotlin. 
+
+The project is divided into Gradle subprojects. The most significant of them are: 
+1. utbot-framework — all about the engine and tests for it
+
+2. utbot-intellij — IDE plugin
+
+3. utbot-sample — a framework with examples to demonstrate engine capacity
+ 
+## Testing
+
+The project contains many tests. They are usually placed in test root of the particular Gradle subproject.
+
+While developing, it\`s useful to run tests from utbot-framework subproject. The majority of tests from this subproject generate tests for samples from the utbot-sample subproject.
+