[readme] add space before code blocks

Author: Pushpendra100

README.md

@@ -73,6 +73,8 @@ Other Style Guides
     - `symbol`
     - `bigint`
 
+    <br />
+
     ```javascript
     const foo = 1;
     let bar = foo;
@@ -91,6 +93,8 @@ Other Style Guides
     - `array`
     - `function`
 
+    <br />
+
     ```javascript
     const foo = [1, 2];
     const bar = foo;