add perl6 code for chapters 1-4 (#49)

.gitignore

@@ -1 +1,29 @@
 .DS_Store
+*.swp
+index.data
+*~
+html/*.html
+html/css/style.css
+html/css/style.css.map
+html/perl6.xhtml
+html/routine/
+html/type/
+html/op/
+html/language/
+html/programs/
+html/syntax/
+html/images/type-graph*
+html/js/search.js
+.precomp
+precompiled
+assets/assetpack.db
+assets/cache
+.sass-cache/
+html/css/style.css.map
+html/links.txt
+xt/aspell.pws
+highlights/node_modules
+**/npm-debug.log
+highlights/atom-language-perl6/
+.DS_store
+highlights/package-lock.json