start readme

README.md

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+
+Run in an empty directory to setup basic files:
+```
+deno run -Ar https://gitea.hptrow.me/SethTrowbridge/gale/raw/branch/master/scaffold.ts
+```
+
+`deno task dev` starts the dev server
+
+`deno task types` scans the deno.json for type declaration files (be sure to then restart the Deno language server)
+
+`entry` in the import map points to the starting file
+
+If you delete the index.html, the dever server can still run using a default