Add ambiguous pronoun rule

.vale/fixtures/RedHat/AmbiguousPronouns/.vale.ini

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

.vale/fixtures/RedHat/AmbiguousPronouns/testinvalid.adoc

@@ -0,0 +1,16 @@
+The manager and the assistant reviewed the document, but she didn't approve it.
+Alex told Jordan that he should study more.
+The teacher gave Sarah her homework.
+The robot and the cat went shopping, but he forgot his wallet.
+John called Tom while he was driving.
+Alex texted Jordan because he was late.
+Tom gave Jerry his book.
+John told Mark that he would win the prize.
+Susan praised Lisa for her presentation.
+The wind blew through the trees as it howled.
+The teacher asked the student to submit her work by Friday.
+The manager called the assistant when she needed the report.
+When Sarah met Emma, she waved.
+When the dog chased the cat, it ran away.
+After the dog chased the cat, it hid under the couch.
+If the robot and the cat go outside, they might get wet.

.vale/fixtures/RedHat/AmbiguousPronouns/testvalid.adoc

@@ -0,0 +1,3 @@
+John called Tom while Tom was driving.
+The dog chased the cat.
+John gave Lucy a book.

.vale/styles/RedHat/AmbiguousPronouns.yml

@@ -0,0 +1,15 @@
+---
+extends: sequence
+message: "Avoid ambiguous pronouns. Replace with a specific noun that has a clear antecedent."
+level: warning
+ignorecase: true
+tokens:
+  # First noun antecedent (common or proper, or named entity)
+  - tag: 'NN|NNP|NNPS|NNS|PERSON|GPE'
+    skip: 8
+  # Second noun antecedent
+  - tag: 'NN|NNP|NNPS|NNS|PERSON|GPE'
+    skip: 8
+  # Ambiguous pronoun
+  - pattern: '\b(it|its|they|he|she|his|her|their)\b'
+    tag: 'PRP|PRP\$'