Added rule for Lists

Author: gaurav-nelson

.vale/fixtures/RedHat/Lists/.vale.ini

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+; Vale configuration file to test the `Lists` rule
+StylesPath = ../../../styles
+MinAlertLevel = suggestion
+[*.adoc]
+RedHat.Lists = YES

.vale/fixtures/RedHat/Lists/testinvalid.adoc

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+Remove the cover:
+- Loosen the captive screws on the side of the cover.
+- Slide the cover toward the back of the computer until the cover clicks
+- Lift the cover straight up

.vale/fixtures/RedHat/Lists/testvalid.adoc

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+Remove the cover:
+- Loosen the captive screws on the side of the cover.
+- Slide the cover toward the back of the computer until the cover clicks.
+- Lift the cover straight up.

.vale/styles/RedHat/Lists.yml

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+---
+extends: conditional
+message: "Write lists so that all or none of the items start with complete sentences. If list items comprise only complete sentences, include a period after each sentence. Except in definition lists, do not include any end punctuation if list items comprise only sentence fragments."
+level: error
+scope: list
+ignorecase: true
+first: '\w+[^.!?]*[.!?]'
+second: '\w+[^.!?]*[.!?]'