Add onboarding screen + token check

context/AppProvider.tsx

@@ -0,0 +1,31 @@
+import {createContext, PropsWithChildren, useContext} from "react";
+import {useStorageState} from '@/context/UseStorageState';
+
+type TokenType = {
+  token: string | null;
+  setToken: (token: string | null) => void;
+  isLoading: boolean;
+}
+
+const TokenContext = createContext<TokenType>({
+  setToken: () => {
+  },
+  token: null,
+  isLoading: true,
+});
+
+export const useToken = () => useContext(TokenContext);
+
+export function AppProvider({ children }: PropsWithChildren) {
+  const [[isLoading, token], setSession] = useStorageState('appToken');
+
+  const tokenContext: TokenType = {
+    token,
+    setToken: (token) => {
+      setSession(token);
+    },
+    isLoading,
+  };
+
+  return <TokenContext.Provider value={tokenContext}>{children}</TokenContext.Provider>;
+}