Added "ThaiG2p" & "DIFFS TH" DiffSinger Thai Phonemizer

OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerThaiPhonemizer.cs

@@ -0,0 +1,23 @@
+using OpenUtau.Api;
+using OpenUtau.Core.G2p;
+
+namespace OpenUtau.Core.DiffSinger
+{
+    [Phonemizer("DiffSinger Thai Phonemizer", "DIFFS TH", language: "TH")]
+    public class DiffSingerThaiPhonemizer : DiffSingerG2pPhonemizer
+    {
+        protected override string GetDictionaryName()=>"dsdict-th.yaml";
+        protected override string GetLangCode()=>"th";
+        protected override IG2p LoadBaseG2p() => new ThaiG2p();
+        protected override string[] GetBaseG2pVowels() => new string[] {
+            "a", "i", "u", "e", "o", "A", "O", "E",
+            "Ua", "U", "ia", "ua", "I", "au"
+        };
+
+        protected override string[] GetBaseG2pConsonants() => new string[] {
+            "b", "ch", "d", "f", "h", "j", "k", "kk", "l", "m", 
+            "n", "ng", "p", "pp", "r", "s", "t", "tt", "w", "W", 
+            "y", "Y", "B", "D", "K"
+        };
+    }
+}