Add readme

Author: SpaiR

README.md

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+# imgui-java
+A handcrafted 1-1 Java binding for [Dear-ImGui](https://github.com/ocornut/imgui).
+
+*Some of the very specific features are still in a wip state.*
+
+### How to use
+TBA
+
+##### Specifics of usage
+* Since it's a 1-1 binding please consider to see official [documentation](https://github.com/ocornut/imgui#usage) and [wiki](https://github.com/ocornut/imgui/wiki) to get more info about how to do things.
+* In places where in C++ you need to pass `ImVec2` or `ImVec4`, you'll need to pass two or four float parameters respectively.
+* When you need to get an output from the Dear-ImGui use wrappers for primitives: `ImBool`, `ImInt` etc.
+
+### How to build
+TBA
+
+### Credits
+This binding is based on the work of [xpenatan](https://github.com/xpenatan) and his version of the binding [jDear-imgui](https://github.com/xpenatan/jDear-imgui).
+
+### License
+See the LICENSE file for license rights and limitations (Apache-2.0).