feat: add csharp interop code generation but no test.

- add csharp interop code generation without testing.
- add annotation for bmap binding project.
- fix README.

CodeGen/BMapBindings/ExpFctDecl.java

@@ -1,16 +1,29 @@
 import java.util.Vector;
 
+/**
+ * The class represent an export BMap function.
+ */
 public class ExpFctDecl {
-	
+
+	/**
+	 * The name of this function.
+	 */
 	public String mFctName;
+	/**
+	 * The return value type of this function.
+	 */
 	public VariableType mFctRetType;
+	/**
+	 * The parameters (arguments) list of this function. Each items are
+	 * {@linkplain ExpFctParamDecl} and represent parameter one by one from left to
+	 * right.
+	 */
 	public Vector<ExpFctParamDecl> mFctParams;
-	
+
 	public ExpFctDecl() {
 		mFctName = "";
 		mFctRetType = new VariableType();
 		mFctParams = new Vector<ExpFctParamDecl>();
 	}
-	
-}
 
+}