[ SCRIPTING ] : Adds Installations script (#71)

* Installatins script added

* unameOUT variable updated

* Homebrew doesn't include pip explicitly, so it was taken out.

* ros2 installation for macOS updated

* ros2 installation for macOS updated

* URl updated

* microros setup updated

* MacOS installations updated

* Cloned Mario in home and not /temp

* Mario repo cloned in home dir

* catkin_pkg installed in macos

* Only ros2-dev branch cloned

* ros2_ws could be run without root privileges now

* ~ changed to /Users/Aryan

* ~ changed to /Users/Aryan

* minor change

* mv changed to cp

* renamed the script and removed old scripts

* renamed the branch name from ros2-dev to humble

* renamed install_codes.sh -> installations.sh

* minor changes

* sourcing command added after ros2 installation

* removed explicit installation of rosdep

* cp -> cp -r and debugging prints

* sourcing of mambaforge done for only mac

* syntax error corrected

* necessary packages added

* soured shell for linux and not for mac

* duplicate package removed

* Added more packages for installations and Linux installation done

* double quotes removed

* /bin/zsh changed to zsh

* micrros cloned in linux

Author: AryanNanda17