Create char literal syntax doc

Author: kellydanma

misc_docs/syntax/language_char_literal.mdx

@@ -0,0 +1,34 @@
+---
+id: "char-literal"
+keywords: ["char"]
+name: "\'\'"
+summary: "This is the `char` literal syntax."
+category: "languageconstructs"
+---
+
+A `char` literal is composed of two **single** quotes. Double quotes are reserved for the `string` type. Note that `char` Char doesn't support Unicode or UTF-8.
+
+### Example
+
+<CodeTab labels={["ReScript", "JS Output"]}>
+
+```res
+let one = '1';
+let upperCaseA = 'A';
+let lowerCaseA = 'a';
+```
+
+```js
+var one = /* '1' */49;
+
+var upperCaseA = /* 'A' */65;
+
+var lowerCaseA = /* 'a' */97;
+```
+
+</CodeTab>
+
+### References
+
+* [Characters](/docs/manual/latest/primitive-types#char)
+* [Strings](/docs/manual/latest/primitive-types#string)