Add main function

src/Controller.java

@@ -23,4 +23,8 @@ public class Controller {
     // maintains an index with the allocation of files to Dstores
     // waits for Dstores to join the datastore (rebalance operation)
     // it doesn't serve any client request until at least R Dstores have joined the system
+
+    public static void main (String[] args) {
+
+    }
 }
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src/Dstore.java

@@ -15,4 +15,8 @@ public class Dstore {
         this.timeout = timeout;
         this. file_folder = file_folder;
     }
+
+    public static void main (String[] args) {
+
+    }
 }
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