Update README.md

README.md

@@ -6,3 +6,49 @@ Learn more at [about.bitty.site](http://about.bitty.site)
 
 Detailed workings [how.bitty.site](http://how.bitty.site)
 
+## Advanced
+
+**Handcrafted HTML files**
+
+Drag one into the editor to convert it.
+
+**Using Codepen.io**
+
+Paste a codepen URL into the editor. Get started with a [template](https://codepen.io/pen?template=MXgrEr) or look at [some samples](https://codepen.io/collection/XprVQL/).
+
+**Size Limits**
+
+While most sites support 2000 bytes, [some can handle more](http://reference.bitty.site).
+      
+**Hosting**
+
+One simple way to host is to [forward a domain](https://support.google.com/domains/answer/4522141?hl=en). Just paste the itty.bitty url in the redirect.
+
+## Generating links programatically
+Encoding (Mac)
+
+```echo -n 'hello world' | lzma -9 | base64 | printf "https://itty.bitty.site/#/%s\n" "$(cat -)"```
+
+Encoding (Linux)
+
+```echo -n 'hello world' | lzma -9 | base64 -w0 | printf "https://itty.bitty.site/#/%s\n" "$(cat -)"```
+
+Encoding (Win Git/WSL)
+
+`echo -n 'hello world' | xz --format=lzma -9 | base64 -w0 | printf "https://itty.bitty.site/#/%s\n" "$(cat -)"`
+
+Encoding (Python)
+
+`base64.b64encode(lzma.compress(bytes("hello world",encoding="utf-8"), format=lzma.FORMAT_ALONE, preset=9))`
+
+Decoding (Mac)
+
+`echo "[URL]" -n | sed  's/^.*#[^\/]*\///g' | base64 -D | lzma -d `
+
+Decoding (Linux)
+
+`echo -n "[URL]" | sed 's/^.*#[^\/]*\///g' | base64 -d | lzma -d`
+
+Decoding (Win)
+
+`echo -n "[URL]" | sed 's/^.*#[^\/]*\///g' | base64 -d | xz --format=lzma -d`