convert wetty from submodule to normal directory

wetty/docs/downloading-files.md

@@ -0,0 +1,44 @@
+# File Downloading
+
+WeTTY supports file downloads by printing terminal escape sequences between a
+base64 encoded file. The name of the downloaded file can optionally be provided,
+also base64 encoded, before the encoded file contents with a `:` separating them.
+
+The terminal escape sequences used are `^[[5i` and `^[[4i` (VT100 for "enter
+auto print" and "exit auto print" respectively -
+https://vt100.net/docs/tp83/appendixc.html).
+
+To take advantage add the following bash function to your `.bashrc`
+
+```bash
+function wetty-download() {
+  file=${1:-/dev/stdin}
+
+  nameprefix=""
+  if [[ -f "$file" ]]; then
+    nameprefix="$(basename "$file" | base64 -w 0):"
+  fi
+
+
+  if [[ -f "$file" || "$file" == "/dev/stdin" ]]; then
+    printf "\033[5i"$nameprefix$(cat "$file" | base64 -w 0)"\033[4i"
+  else
+    echo "$file does not appear to be a file"
+  fi
+}
+```
+
+You are then able to download files via WeTTY!
+
+```bash
+wetty-download my-pdf-file.pdf
+```
+
+or you can still use the classic style:
+
+```bash
+$ cat my-pdf-file.pdf | wetty-download
+```
+
+WeTTY will then issue a popup like the following that links to a local file
+blob: `Download ready: file-20191015233654.pdf`