Add course: Python for OSINT. 21 day course for beginners (#9362) (#9483)

* Add course: Python for OSINT. 21 day course for beginners (#9362)

* Fix alphabetical ordering in free-courses-en.md

* Update courses/free-courses-en.md

Co-authored-by: Eric Hellman <eric@hellman.net>

* Update free-courses-en.md

* Update free-courses-en.md

---------

Co-authored-by: Eric Hellman <eric@hellman.net>

courses/free-courses-en.md

@@ -1218,6 +1218,7 @@
 * [Python for Beginners (Full Course)](https://www.youtube.com/playlist?list=PLsyeobzWxl7poL9JTVyndKe62ieoN-MZ3) - Telusko
 * [Python for Data Science, AI & Development](https://www.coursera.org/learn/python-for-applied-data-science-ai) - Joseph Santarcangelo (Coursera)
 * [Python for Everybody](https://www.py4e.com/lessons) (Coursera Reading Materials with YouTube Videos)
+* [Python for OSINT. 21 day course for beginners](https://github.com/cipher387/python-for-OSINT-21-days/raw/main/Python%20for%20OSINT.%2021%20day%20course%20for%20beginners.pdf) - cyb_detective (PDF)
 * [Python from Scratch](https://open.cs.uwaterloo.ca/python-from-scratch/) - Centre for Education in Math and Computing (University of Waterloo)
 * [Python GUI's With TKinter](https://youtube.com/playlist?list=PLCC34OHNcOtoC6GglhF3ncJ5rLwQrLGnV) - Codemy.com
 * [Python in 80 minutes](https://www.udemy.com/course/learn-python-in-80-minutes/) - Muhammed Ali Dilek (Udemy)