add redux reducers

src/reducers/appointmentReducer.js

+import {
+    APPOINTMENT_FETCH,
+    APPOINTMENT_CREATE,
+    APPOINTMENT_UPDATE,
+    APPOINTMENT_DELETE,
+} from './../actions/types'
+import { Alert } from 'react-native'
+import { ToastAndroid } from 'react-native';
+
+const INITIAL_STATE = { appointments: [] }
+
+export default (state = INITIAL_STATE, action) => {
+    switch (action.type) {
+
+        case APPOINTMENT_CREATE:
+            state = Object.assign([], state, { appointments: action.payload })
+            return state;
+
+        case APPOINTMENT_FETCH:
+            state = Object.assign([], state, { appointments: action.payload });
+            return state;
+
+        case APPOINTMENT_UPDATE:
+            state = Object.assign([], state, { appointments: action.payload });
+            return state;
+
+        case APPOINTMENT_DELETE:
+            state = Object.assign([], state, { appointments: action.payload });
+            return state;
+
+        default:
+            return state
+    }
+}

src/reducers/index.js

 import { combineReducers } from 'redux'
+import appointmentReducer from './appointmentReducer'
+import reminderReducer from './reminderReducer'
 
 export default combineReducers({
-  libraries: () => []
+  appointments: appointmentReducer,
+  reminders: reminderReducer
 });
\ No newline at end of file

src/reducers/reminderReducer.js

+import {
+    REMINDER_FETCH,
+    REMINDER_CREATE,
+    REMINDER_UPDATE,
+    REMINDER_DELETE,
+} from './../actions/types'
+import { ToastAndroid } from 'react-native';
+
+const INITIAL_STATE = { reminders: [] }
+
+export default (state = INITIAL_STATE, action) => {
+    switch (action.type) {
+
+        case REMINDER_CREATE:
+            state = Object.assign([], state, { reminders: action.payload })
+            return state;
+
+        case REMINDER_FETCH:
+            state = Object.assign([], state, { reminders: action.payload });
+            return state;
+
+        case REMINDER_UPDATE:
+            state = Object.assign([], state, { reminders: action.payload });
+            return state;
+
+        case REMINDER_DELETE:
+            state = Object.assign([], state, { reminders: action.payload });
+            return state;
+
+        default:
+            return state
+    }
+}