Update tj.jl

I've added an Sy operator for the tJ site types

Author: andrewkhardy

src/lib/SiteTypes/src/sitetypes/tj.jl

@@ -183,7 +183,13 @@ function op!(Op::ITensor, ::OpName"Sx", ::SiteType"tJ", s::Index)
   Op[s' => 2, s => 3] = 0.5
   return Op[s' => 3, s => 2] = 0.5
 end
-
+function op!(Op::ITensor, ::OpName"Sy", ::SiteType"tJ", s::Index)
+    Op[s' => 2, s => 3] = -1im*0.5
+    return Op[s' => 3, s => 2] = 1im*0.5
+  end
+function op!(Op::ITensor, ::OpName"Sʸ", st::SiteType"tJ", s::Index)
+  return op!(Op, OpName("Sy"), st, s)
+end 
 function op!(Op::ITensor, ::OpName"Sˣ", st::SiteType"tJ", s::Index)
   return op!(Op, OpName("Sx"), st, s)
 end