Added createCommSystemPointingIntervals.m

[ndelago]

Describe the changes in this pull request

Added a new Matlab script to General Utilities and updated the readme file

Checklist before requesting a review

• [X] Did you update the proper readme file?
• [X] Did you list any dependencies in the readme?
• [X] Is there a scenario that you need to link to?

[jpthompson212]

LGTM