started work on variable table

pkg/shsh/var_table.go

@@ -0,0 +1,17 @@
+package shsh
+
+import (
+    "strings"
+)
+
+type VarTable map[string]*Token
+
+var (
+    GlobalVarTable *VarTable
+)
+
+// Library represents variables defined in inner scope
+// It is assumed library is ordered from innermost scope to outermost scope
+func GetVar(arg string, library []VarTable) *Token {
+    
+}