Add ObjectStore source

src/cloud/lunarsky/store/StoreException.java

@@ -0,0 +1,11 @@
+package cloud.lunarsky.store;
+
+final class StoreException extends RuntimeException {
+    final int status;
+    final String code;
+    StoreException(int status, String code, String message) {
+        super(message);
+        this.status = status;
+        this.code = code;
+    }
+}