adding free rtos to lab 2

...rt-2/vendor/FreeRTOS/.github/ISSUE_TEMPLATE/bug-report.md

...or/FreeRTOS/.github/ISSUE_TEMPLATE/documentation-issue.md

...b-part-2/vendor/FreeRTOS/.github/pull_request_template.md

...mware-lab-part-2/vendor/FreeRTOS/.github/workflows/ci.yml

...yflie-firmware-lab-part-2/vendor/FreeRTOS/CONTRIBUTING.md

...ab-part-2/vendor/FreeRTOS/GitHub-FreeRTOS-Kernel-Home.url

...crazyflie-firmware-lab-part-2/vendor/FreeRTOS/History.txt

.../crazyflie-firmware-lab-part-2/vendor/FreeRTOS/LICENSE.md

...firmware-lab-part-2/vendor/FreeRTOS/Quick_Start_Guide.url

...e/crazyflie-firmware-lab-part-2/vendor/FreeRTOS/README.md

...crazyflie-firmware-lab-part-2/vendor/FreeRTOS/SECURITY.md

.../crazyflie-firmware-lab-part-2/vendor/FreeRTOS/croutine.c

...zyflie-firmware-lab-part-2/vendor/FreeRTOS/event_groups.c

...ie-firmware-lab-part-2/vendor/FreeRTOS/include/FreeRTOS.h

...firmware-lab-part-2/vendor/FreeRTOS/include/StackMacros.h

...flie-firmware-lab-part-2/vendor/FreeRTOS/include/atomic.h

...ie-firmware-lab-part-2/vendor/FreeRTOS/include/croutine.h

...b-part-2/vendor/FreeRTOS/include/deprecated_definitions.h

...irmware-lab-part-2/vendor/FreeRTOS/include/event_groups.h

...zyflie-firmware-lab-part-2/vendor/FreeRTOS/include/list.h