doc: add intermediate representation language

doc/sample/Simple.im

@@ -1,15 +1,3 @@
-package simple.pkg
+v = 2 + 3 * 4.
 
-use std.io
-
-class Simple
-    - init(name:name age:age)
-        v = 1 + 2 squared + not 3.
-        self::name = name.
-        self::age = age!
-
-    - name | ^self::name.
-
-    - age
-        ^self::age!
-end
+cout put:v

doc/sample/Sum.im

@@ -1,29 +1,28 @@
 package net.doorstuck.test
 
-cout put:'Finds the sum of a set of numbers.'
+cout put:'Finds the sum of a set of numbers.'.
 
-sum = 0
+sum = 0.
 
 while true do
-    cout print:'Number (blank to finish): '
-    cout flush
+    cout print:'Number (blank to finish): '.
+    cout flush.
 
-    input = ''
-    v = 0
-    cin get:input
+    v = 0.
+    input = cin readLine.
 
     if input == '' then
         break
     end
 
-    try
-        v = Int parse:input
-    catch (#err:number_format, err)
-        cout put:'{input} is not a valid number.'
+    v = Int parse:input.
+
+    if v == null then
+        cout put:'{input} is not a valid number.'.
         continue
     end
 
-    sum += v
+    sum += v.
 end
 
 cout put:'Sum: {sum}'