Update guidance

Author: laike9m

docs/Contribute.md

@@ -1,4 +1,13 @@
-# How to add a new challange?
+# So you want to create a new challange
+
+Awesome, this guide will help you create a new challenge. Before diving into the details, there's an important question: how to find an idea for a new challenge? There are two good ways:
+
+- Real-world problems you encountered in work and/or study;
+- Every typing related PEP has numerous examples discussing different uses cases (e.g. [PEP 646](https://peps.python.org/pep-0646/))
+
+Once you come up with an idea, go to the next steps.
+
+# Steps
 
 1. Fork this project if you haven't done so
 
@@ -13,7 +22,8 @@
    ```python
    """
    TODO:
-     foo should accept a dict argument, both keys and values are string.
+
+   foo should accept a dict argument, both keys and values are string.
    """
 
    def foo(x):