added self organising maps algorithm in the machine learning section. (#6877)

* added self organising maps algo

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update machine_learning/Self_Organising_Maps.py

* Update and rename Self_Organising_Maps.py to self_organizing_map.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Update self_organizing_map.py

* Update self_organizing_map.py

* Update self_organizing_map.py

* Update self_organizing_map.py

Co-authored-by: Eeman Majumder <eemanmajumder@Eemans-MacBook-Pro.local>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Christian Clauss <cclauss@me.com>