Add VSCode debug configuration for Java (#2916)

.vscode/launch.json

@@ -1,7 +1,16 @@
 {
     "version": "0.2.0",
     "configurations": [
-
+        {
+            "type": "java",
+            "name": "Java - Debug (Launch)",
+            "request": "launch",
+            "cwd": "${workspaceFolder}/clients/java/",
+            "console": "externalTerminal",
+            "stopOnEntry": false,
+            "mainClass": "com.microsoft.aspnet.signalr.Chat",
+            "args": ""
+        },
         {
             "type": "node",
             "request": "attach",

clients/java/signalr/.gitignore

@@ -7,5 +7,7 @@ bin/
 out/
 *.class
 *.jar
+.project
+.classpath
 # We need the gradle-wrapper.jar file so that others can use the gradle wrapper
 !gradle/wrapper/gradle-wrapper.jar