added max file size validation to frontend

.env.example

@@ -1,4 +1,6 @@
 APPWRITE_FUNCTION_API_KEY=
 # IMPORTANT If you're running the website inside docker and your Appwrite instance runs on localhost host,
 # use host.docker.internal instead of localhost
-APPWRITE_HOST=http://appwrite/v1
+APPWRITE_HOST=http://host.docker.internal/v1
+# Must be the same as in the _APP_STORAGE_LIMIT in the Appwrite env file
+NEXT_PUBLIC_MAX_FILE_SIZE=300000000