Generate wallet and sign message (#4)

* Store mnemonic and private key seperately

* Change variable names

* Refactor code in seperate components

* Display wallet details

* Remove unnecessary imports

* Make review changes

* Add method to reset wallet

* Make component self closing

* separate imports

---------

Co-authored-by: Adw8 <adwait@deepstacksoft.com>

styles/stylesheet.js

@@ -8,7 +8,7 @@ const styles = StyleSheet.create({
   },
   headerText: {
     color: 'black',
-    fontSize: 22,
+    fontSize: 26,
     fontWeight: 'bold',
   },
   sectionContainer: {
@@ -16,7 +16,7 @@ const styles = StyleSheet.create({
     paddingHorizontal: 24,
   },
   sectionTitle: {
-    fontSize: 24,
+    fontSize: 22,
     fontWeight: '600',
   },
   sectionDescription: {