Add state management

src/state/models/root-store.ts

@@ -0,0 +1,16 @@
+/**
+ * The root store is the base of all modeled state.
+ */
+
+import {Instance, SnapshotOut, types} from 'mobx-state-tree'
+import {createContext, useContext} from 'react'
+
+export const RootStoreModel = types.model('RootStore').props({})
+
+export interface RootStore extends Instance<typeof RootStoreModel> {}
+export interface RootStoreSnapshot extends SnapshotOut<typeof RootStoreModel> {}
+
+// react context & hook utilities
+const RootStoreContext = createContext<RootStore>({} as RootStore)
+export const RootStoreProvider = RootStoreContext.Provider
+export const useStores = () => useContext(RootStoreContext)