added config file

data/cfg.json

@@ -0,0 +1,6 @@
+{
+  "bk_week": {
+    "fetch_limit": 100,
+    "subreddits": "bytedicetesting"
+  }
+}

data/cfg_default.json

@@ -0,0 +1,6 @@
+{
+  "bk_week": {
+    "subreddits": "bytedicetesting",
+    "fetch_limit": 100 
+  }
+}