added client RA bill wise download report

app/config.py

@@ -0,0 +1,29 @@
+import os
+# project base url
+BASE_DIR = os.path.abspath(os.path.dirname(__file__))
+
+class Config:
+    # secret key
+    SECRET_KEY = os.getenv("SECRET_KEY", "dev-secret-key")
+ 
+    # Database varibles 
+    DB_DIALECT = os.getenv("DB_DIALECT")
+    DB_DRIVER = os.getenv("DB_DRIVER")
+    DB_USER = os.getenv("DB_USER")
+    DB_PASSWORD = os.getenv("DB_PASSWORD")
+    DB_HOST = os.getenv("DB_HOST")
+    DB_PORT = os.getenv("DB_PORT")
+    DB_NAME = os.getenv("DB_NAME")
+    # database connection url
+    SQLALCHEMY_DATABASE_URI = (
+        f"{DB_DIALECT}+{DB_DRIVER}://"
+        f"{DB_USER}:{DB_PASSWORD}@"
+        f"{DB_HOST}:{DB_PORT}/"
+        f"{DB_NAME}"
+    )
+
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    # uploads folder path
+    UPLOAD_FOLDER = os.path.join(BASE_DIR, "static", "uploads")
+    # file extension
+    ALLOWED_EXTENSIONS = {"xlsx", "xls", "csv"}