Added a new section that requires the use of open source software and services where available

[TheRyanHowell]

This is an attempt at adding to the manifesto and resolve #290.

[Floppy]

👍

[PaulJRobinson]

Defo 👍

[philipjohn]

👍 Make it so

[Floppy]

This should be ready to merge now... yay!

[Floppy]

This proposal is open for discussion and voting. If you are a contributor to this repository (and not the proposer), you may vote on whether or not it is accepted.

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vote	symbol	type this	points
Agree	👍	:thumbsup:	1
Abstain	✋	:hand:	-1
Block	👎	:thumbsdown:	-1000

Proposals will be accepted and merged once they have a total of 2 points when all votes are counted. Votes will be open for a minimum of 7 days, but will be closed if the proposal is not accepted after 90.

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