adds File Helper, project files and gitignore

java_src/FileHelper.java

@@ -0,0 +1,16 @@
+package java_src;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class FileHelper {
+
+    public static String readJson(Path path) throws IOException {
+        StringBuilder jsonString = new StringBuilder();
+        for (String line : Files.readAllLines(path)) {
+            jsonString.append(line);
+        }
+        return jsonString.toString();
+    }
+}