Modify Rule S1192: Add Dart language

rules/S1192/dart/metadata.json

@@ -0,0 +1,3 @@
+{
+  
+}

rules/S1192/dart/rule.adoc

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+== Why is this an issue?
+
+include::../description.adoc[]
+
+=== Exceptions
+
+To prevent generating some false-positives, literals having 5 or less characters are excluded as well as literals containing only letters, digits and '_'.
+
+== How to fix it
+
+include::../howtofix.adoc[]
+
+=== Code examples
+
+==== Noncompliant code example
+
+With the default threshold of 3:
+
+[source,dart,diff-id=1,diff-type=noncompliant]
+----
+class A {
+  void run() {
+    prepare('string literal');    // Noncompliant - "string literal" is duplicated 3 times
+    execute('string literal');
+    release('string literal');
+  }
+}
+----
+
+==== Compliant solution
+
+[source,dart,diff-id=1,diff-type=compliant]
+----
+class A {
+  static const _const = 'string literal';
+
+  void run() {
+    prepare(_const);    // Compliant
+    execute(_const);
+    release(_const);
+  }
+}
+----
+
+ifdef::env-github,rspecator-view[]
+
+'''
+== Implementation Specification
+(visible only on this page)
+
+include::../message.adoc[]
+
+include::../parameters.adoc[]
+
+include::../highlighting.adoc[]
+
+'''
+
+
+endif::env-github,rspecator-view[]