docs: add yarn install instructions

I like to copy-and-paste the command and I use yarn, not npm, so I prefer it when library devs add the yarn command too.
SConaway · Oct 30, 2020 · 9f50861 · 9f50861
1 parent 31512d5
commit 9f50861
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/README.md b/README.md
@@ -8,23 +8,28 @@ Credit Card Component for React Native -- Display Only. At the moment, it only s
 npm install react-native-credit-card-display
 ```
 
+or
+
+```sh
+yarn add react-native-credit-card-display
+```
+
 ## Basic Example
 
 ```js
-import CreditCardDisplay from "react-native-credit-card-display";
+import CreditCardDisplay from 'react-native-credit-card-display';
 
 // ...
 
 return (
- {/* ... */}
  <CreditCardDisplay
  number={4242424242424242}
  cvc={123}
  expiration="04/21"
  name="John J. Doe"
  since="2004"
  />
-)
+);
 ```
 
 ## Props