Added python baics section

Author: Abhijnan03

books/_toc.yml

@@ -2,7 +2,10 @@ format: jb-book
 root: index
 chapters:
   - file: setup
-  - file: resources
+  - file: python_basics/intro
+  sections:
+    - file: python_basics/python_basics
+    - file: python_basics/resources
   - file: review_nm/intro
     sections:
     - file: review_nm/error