Adding en dash rule

.vale/fixtures/RedHat/EnDashes/.vale.ini

@@ -0,0 +1,5 @@
+; Vale configuration file to test the `EnDashes` rule
+StylesPath = ../../../styles
+MinAlertLevel = suggestion
+[*.adoc]
+RedHat.EnDashes = YES

.vale/fixtures/RedHat/EnDashes/testinvalid.adoc

@@ -0,0 +1 @@
+September - December

.vale/fixtures/RedHat/EnDashes/testvalid.adoc

@@ -0,0 +1,4 @@
+numbers 12–15
+pages 100–107
+X'41'–X'FE'
+September–December

.vale/styles/RedHat/EnDashes.yml

@@ -0,0 +1,10 @@
+---
+extends: substitution
+level: warning
+link: https://redhat-documentation.github.io/vale-at-red-hat/docs/main/reference-guide/endashes/
+message: "Use an en dash to show a range, or inclusive numbers, letters, pages, dates, or codes. Do not use spaces before or after the en dash."
+nonword: true
+action:
+  name: replace
+swap:
+  \s-\s: –

modules/reference-guide/nav.adoc

@@ -8,6 +8,7 @@
 * xref:definitions.adoc[]
 * xref:donotuse.adoc[]
 * xref:ellipses.adoc[]
+* xref:endashes.adoc[]
 * xref:headingpunctuation.adoc[]
 * xref:headings.adoc[]
 * xref:hyphens.adoc[]

modules/reference-guide/pages/endashes.adoc

@@ -0,0 +1,12 @@
+:navtitle: endashes
+:keywords: reference, rule, endashes
+
+= En Dashes
+
+Use an en dash to show a range, or inclusive numbers, letters, pages, dates, or codes.
+Do not use spaces before or after the en dash.
+
+.Additional resources
+
+* link:{ibmsg-url-print}[{ibmsg-print} - En dashes, p.48]
+* link:{ibmsg-url}?topic=punctuation-dashes#showing-ranges-with-en-dashes[{ibmsg} - Showing ranges with en dashes]