Pi Readme (Bengali Translation) C-1 L-1 (#107)

* dummy txt for Trans placeholder

* Update .dummy.md

* translations structured with dummy

* translations structured with dummy

* dummy.md updated

* Update .dummy.md

* Update all .dummy.md

* Fixed .dummy

* Delete .dummy.md

* Create README.bn.md

* Fixed hyperlinks

* Create assignment.bn.md

* Create pi.bn.md

Co-authored-by: Jim Bennett <[email protected]>

Author: Iftu119