Add msbt parse classes for docs

Originally ported from https://github.com/Martin005/SMO_Translation_Helper , via https://github.com/IcySon55/3DLandMSBTeditor

Add some tests to ensure functions

NHSE.Parsing/MSBT/MSBTEncodingByte.cs

@@ -0,0 +1,8 @@
+namespace NHSE.Parsing
+{
+    public enum MSBTEncodingByte : byte
+    {
+        UTF8 = 0x00,
+        Unicode = 0x01
+    }
+}