[lib] Added overview of code point utility class

Author: mta452

tehreer-android/src/main/java/com/mta/tehreer/unicode/CodePoint.java

@@ -18,6 +18,9 @@
 
 import com.mta.tehreer.internal.JniBridge;
 
+/**
+ * Provides static utility methods for unicode code points.
+ */
 public class CodePoint {
     static {
         JniBridge.loadLibrary();