added celery functionality

added CRUD base

db/manager.py

@@ -0,0 +1,31 @@
+from pymongo import MongoClient
+from config.db import MONGO_HOST, MONGO_PORT, MONGO_DB
+
+
+class DbManager(object):
+    def __init__(self):
+        self.mongo = MongoClient(host=MONGO_HOST, port=MONGO_PORT)
+        self.db = self.mongo[MONGO_DB]
+
+    # TODO: CRUD
+    def save(self, col_name: str, item, **kwargs):
+        col = self.db[col_name]
+        col.save(item, **kwargs)
+
+    def remove(self, col_name: str, cond: dict, **kwargs):
+        col = self.db[col_name]
+        col.remove(cond, **kwargs)
+
+    def update(self, col_name: str, cond: dict, values: dict, **kwargs):
+        col = self.db[col_name]
+        col.update(cond, {'$set': values}, **kwargs)
+
+    def list(self, col_name: str, cond: dict, skip: int, limit: int, **kwargs):
+        if kwargs.get('page') is not None:
+            try:
+                page = int(kwargs.get('page'))
+                skip = page * limit
+            except Exception as err:
+                pass
+        # TODO: list logic
+        # TODO: pagination