adding to the readme all the build information

Author: madhephaestus

bindings/java/README.md

@@ -2,7 +2,49 @@
 
 [![Clojars Project](https://img.shields.io/clojars/v/com.github.madhephaestus/manifold3d.svg)](https://clojars.org/com.github.madhephaestus/manifold3d)
 
-##Developemnt
+## Developemnt
+
+First build the C code:
+
+#### Linux
+
+```
+        bash bindings/java/scripts/linux/buildC.sh
+        cd bindings/java/
+        mvn test --file pom.xml --no-transfer-progress
+```        
+
+#### MacOS
+
+```
+      mkdir build
+        cd build
+        cmake  -DMANIFOLD_CROSS_SECTION=ON -DMANIFOLD_USE_BUILTIN_CLIPPER2=ON -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DMANIFOLD_STRICT=ON -DMANIFOLD_USE_BUILTIN_TBB=ON -DMANIFOLD_DEBUG=ON -DMANIFOLD_ASSERT=ON -DMANIFOLD_PYBIND=OFF -DMANIFOLD_PAR=ON .. && make
+        cd ..
+        mkdir -p ./bindings/java/src/main/resources/manifold3d/natives/mac-arm64/
+        ls -al ./build/src/
+        cp ./build/src/libmanifold.dylib ./bindings/java/src/main/resources/manifold3d/natives/mac-arm64/
+        cp ./build/bindings/c/libmanifoldc.dylib ./bindings/java/src/main/resources/manifold3d/natives/mac-arm64/
+        cd bindings/java/
+        mvn test --file pom.xml --no-transfer-progress
+```
+        
+#### Windows
+
+
+```
+        cmake . -DMANIFOLD_CROSS_SECTION=ON -DMANIFOLD_USE_BUILTIN_CLIPPER2=ON  -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DMANIFOLD_DEBUG=ON -DMANIFOLD_STRICT=ON -DMANIFOLD_PAR=ON -DMANIFOLD_EXPORT=ON -DMANIFOLD_USE_BUILTIN_TBB=ON -DMANIFOLD_ASSERT=ON -DMANIFOLD_PAR=ON -A x64 -B build
+        cd build
+        cmake --build . --target ALL_BUILD --config Release
+        cd ..
+        mkdir -p bindings\java\src\main\resources\manifold3d\natives\win-x86_64\
+        cp build\lib\Release\manifold.dll bindings\java\src\main\resources\manifold3d\natives\win-x86_64\manifold.dll
+        cp build\lib\Release\manifoldc.dll bindings\java\src\main\resources\manifold3d\natives\win-x86_64\manifoldc.dll
+        cd bindings\java
+        mvn test --file pom.xml --no-transfer-progress
+```
+        
+#### Maven install
 
 for local install to maven of a snapshot run: