Introduce docs (#5)

docs/essentials/code.mdx

@@ -0,0 +1,37 @@
+---
+title: 'Code Blocks'
+description: 'Display inline code and code blocks'
+icon: 'code'
+---
+
+## Basic
+
+### Inline Code
+
+To denote a `word` or `phrase` as code, enclose it in backticks (`).
+
+```
+To denote a `word` or `phrase` as code, enclose it in backticks (`).
+```
+
+### Code Block
+
+Use [fenced code blocks](https://www.markdownguide.org/extended-syntax/#fenced-code-blocks) by enclosing code in three backticks and follow the leading ticks with the programming language of your snippet to get syntax highlighting. Optionally, you can also write the name of your code after the programming language.
+
+```java HelloWorld.java
+class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}
+```
+
+````md
+```java HelloWorld.java
+class HelloWorld {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}
+```
+````