Add a simple example

Minimal/Examples.lean

@@ -0,0 +1,38 @@
+import Minimal.Calculus
+
+open Term
+open OptionalAttr
+open Reduce
+
+-- ⟦ a ↦ ⟦ ⟧ ⟧.a
+def example1 : Term :=
+  dot
+    (obj
+      (Bindings.cons
+        "a"
+        (by simp)
+        (attached (obj (Bindings.nil)))
+        Bindings.nil))
+    "a"
+
+-- ⟦ ⟧
+def example1' : Term := obj Bindings.nil
+
+-- ⟦ a ↦ ⟦ ⟧ ⟧.a ⇝ ⟦ ⟧
+def test1_red1 : example1 ⇝ example1' := by
+  rw [example1, example1']
+  exact (dot_c
+    (obj Bindings.nil)
+    "a"
+    (Bindings.cons
+      "a"
+      (by simp)
+      (attached (obj (Bindings.nil)))
+      Bindings.nil)
+    (by simp)
+    (by simp [lookup]))
+
+-- ⟦ a ↦ ⟦ ⟧ ⟧.a ⇝* ⟦ ⟧
+def test1 : example1 ⇝* example1' := ReflTransGen.head
+  test1_red1
+  ReflTransGen.refl