chore: Tomogram stub

Tomogram.lean

@@ -0,0 +1,3 @@
+
+def main : IO Unit := do
+  IO.println "tomogram stub"

lakefile.lean

@@ -10,6 +10,7 @@ lean_lib Pantograph {
 
 lean_lib Repl {
 }
+
 @[default_target]
 lean_exe repl {
   root := `Main
@@ -17,6 +18,13 @@ lean_exe repl {
   supportInterpreter := true
 }
 
+@[default_target]
+lean_exe tomogram {
+  root := `Tomogram
+  -- Solves the native symbol not found problem
+  supportInterpreter := true
+}
+
 require LSpec from git
   "https://github.com/argumentcomputer/LSpec.git" @ "a6652a48b5c67b0d8dd3930fad6390a97d127e8d"
 lean_lib Test {