added examples (fib,69420/fizzbuzz)

examples/69420.zorth

@@ -0,0 +1,25 @@
+: over swap dup rot rot ;
+: mod over over / * - ;
+
+1
+
+begin
+  dup 50<
+while
+  dup 15 mod 0 = if
+    69420 .
+  else
+    dup 3 mod 0 = if
+      69 .
+    else
+      dup 3 mod 0 = if
+        420 .
+      else
+        dup .
+      fi 
+    fi
+  fi
+  1+
+repeat
+
+ret

examples/fib.zorth

@@ -0,0 +1,18 @@
+: fib
+  0 1
+  begin
+    rot
+    dup 0> 
+  while
+    1-
+    rot rot
+    dup
+    dup .
+    rot 
+    +
+  repeat
+; 
+
+15 fib
+
+ret