Add basic readme to use the lexer

Author: sudo-jarvis

README.rst

@@ -15,3 +15,46 @@
 .. |CI| image:: https://github.com/python-jsonschema/jsonschema-lexer/workflows/CI/badge.svg
   :alt: Build status
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+
+
+Introduction
+------------
+
+`jsonschema-lexer` is a Python package that provides a JSON Schema lexer for syntax highlighting JSON Schema documents. It utilizes Pygments, a syntax highlighting library, to tokenize JSON Schema documents according to the JSON Schema specification.
+
+Usage
+-----
+
+Once installed, you can use it in your Python code to highlight JSON Schema documents. 
+
+Here's a simple example:
+
+.. code-block:: python
+
+  from jsonschema_lexer.lexer import JSONSchemaLexer
+
+  from rich.syntax import Syntax
+  console = Console()
+
+  code = """
+  {
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://example.com/product.schema.json",
+    "title": "Product",
+    "description": "A product from Acme's catalog",
+    "type": "object",
+    "properties": {
+      "productId": {
+        "description": "The unique identifier for a product",
+        "type": "integer"
+      },
+      "productName": {
+        "description": "Name of the product",
+        "type": "string"
+      }
+    }
+  }
+  """
+
+  syntax = Syntax(code, lexer=JSONSchemaLexer(), background_color="default", word_wrap=True)
+  console.print(syntax)