Added singleton config and changed module structure

neuroapi/_methods/admin.py

@@ -0,0 +1,18 @@
+from aiohttp import ClientSession
+
+from .api_method import ApiMethod
+
+
+class Admin(ApiMethod):
+
+    async def get(self):
+        async with ClientSession() as session:
+            response = await session.get(self.api_url+'/admin/get')
+        return await response.json()
+
+    async def is_admin(self, id: str):
+        async with ClientSession() as session:
+            response = await session.get(self.api_url+f'/admin/is-admin/{id}')
+        if await response.text() == 'false':
+            return False
+        return True