added db connection to auth server and added usermanagement code

Auth Server/database.py

@@ -0,0 +1,20 @@
+import psycopg2
+
+class Database:
+    __conn:psycopg2.connect
+    __cursor:psycopg2.cursor
+
+    def __init__(self, database:str, host:str, user:str, password:str, port:str):
+        self.__conn = psycopg2.connect(database=database, host=host, user=user, password=password, port=port)
+        self.__cursor = self.__conn.cursor()
+
+    def getConnection(self) -> psycopg2.connect:
+        return self.__conn
+    
+    def fetchall(self, query:str):
+        self.__cursor.execute(query)
+        return self.__cursor.fetchall()
+    
+    def fetchall(self, query:str):
+        self.__cursor.execute(query)
+        return self.__cursor.fetchone()