Create ruleset: W3C Test

[FranklinYu]

I skipped the punycode prefix xn-- in XML comment because it is illegal there. Punycode is not very common in the atlas; I found following examples:

https-everywhere/src/chrome/content/rules/Josefsson.org.xml

Line 12 in a5c787b

<target host="xn--rksmrgs-5wao1o.josefsson.org" />

https-everywhere/src/chrome/content/rules/JS.org.xml

Line 1784 in a5c787b

<test url="http://xn--z7h.js.org/" />

https-everywhere/src/chrome/content/rules/xn--90aijkdmaud0d.xn--p1ai.xml

Lines 1 to 10 in a5c787b

	<ruleset name="мособлеирц.рф" default_off='failed ruleset test'>
	<target host="xn--90aijkdmaud0d.xn--p1ai" />
	<target host="www.xn--90aijkdmaud0d.xn--p1ai" />
	<target host="xn--b1aoke0e.xn--90aijkdmaud0d.xn--p1ai" />
	<target host="www.xn--b1aoke0e.xn--90aijkdmaud0d.xn--p1ai" />
	<target host="xn--j1aab.xn--90aijkdmaud0d.xn--p1ai" />
	<target host="www.xn--j1aab.xn--90aijkdmaud0d.xn--p1ai" />
	<rule from="^http:" to="https:" />
	</ruleset>

None of them added comment about the code.

[FranklinYu]

Please also advise whether this ruleset should merge with https://github.com/EFForg/https-everywhere/blob/master/src/chrome/content/rules/W3C.xml.

[FranklinYu]

Anyone kindly review this PR?

[J0WI]

LGTM, thanks!

Please also advise whether this ruleset should merge with https://github.com/EFForg/https-everywhere/blob/master/src/chrome/content/rules/W3C.xml.

I prefer separate files, but you can add a hint in the comments of both rulesets, that they are related. Similar to what we do in Amazon.xml.

[J0WI]

Thanks!