chore: add GPL v3 license and update test artifacts

- Add LICENSE file with GNU General Public License v3
- Update README.md documentation
- Rebuild ChatFormatterTest class with latest changes
- Ensure project licensing compliance and clarity

src/test/java/com/loki/lochat/utils/ChatFormatterTest.java

@@ -38,6 +38,7 @@ class ChatFormatterTest {
     }
 
     @Test
+    @SuppressWarnings("deprecation")
     void testReplaceEmojis() {
         String result = ChatFormatter.replaceEmojis("Test :smile:");
         assertEquals("Test :smile:", result);