Added sign in errors and logos.

components/styles.js

@@ -0,0 +1,15 @@
+import { StyleSheet } from "react-native";
+import { Row } from "native-base";
+
+export default StyleSheet.create({
+  contentContainer__centered: {
+    justifyContent: "center",
+    flex: 1,
+  },
+
+  evenlySpacedRow: {
+    flexDirection: "row",
+    justifyContent: "space-evenly",
+    alignItems: "center",
+  },
+});