Add base project

Implement auth method

example/src/App.tsx

@@ -0,0 +1,37 @@
+import { StyleSheet, View, Button } from 'react-native';
+import { auth } from 'react-native-pubky';
+
+export default function App() {
+  return (
+    <View style={styles.container}>
+      <Button
+        title={'auth'}
+        onPress={async (): Promise<void> => {
+          try {
+            const res = await auth('pubkyAuthUrl', 'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855');
+            if (res.isErr()) {
+              console.log(res.error.message);
+              return;
+            }
+            console.log(res.value);
+          } catch (e) {
+            console.log(e);
+          }
+        }}
+      />
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  box: {
+    width: 60,
+    height: 60,
+    marginVertical: 20,
+  },
+});