Added Capitalize String Challenge (#49)

* Added template

* Updated template

* Add files via upload

* Create capitalize_string.py

* Fixed expected behavior

Author: jrg94

challenges/how-to-capitalize-a-string/README.md

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+## How to Capitalize a String in Python Challenge
+
+The following challenge was described in the article 
+[How to Capitalize a String in Python](https://therenegadecoder.com/code/how-to-capitalize-a-string-in-python/#challenge).
+
+### Challenge Description
+
+Write a function which returns a copy of the string with its first character capitalized and the rest lowercased.
+
+### Expected Behavior
+
+```python
+capitalize("howdy")  # returns "Howdy"
+capitalize("shRUb")  # returns "Shrub" 
+``` 
+
+### Example Solution
+
+![Solution](solution.jfif)

challenges/how-to-capitalize-a-string/capitalize_string.py

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+def capitalize(string):
+  return string[0].upper() + string[1:].lower()