Add readme

README.md

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+# Covergen
+
+Just generates some magic PDF invoice covers using straight up dark magic.
+
+## Just be lazy
+
+Go see it in action and download it from [https://s3.blacknova.io/covergen/index.html](https://s3.blacknova.io/covergen/index.html)
+
+## Just build it
+
+```
+$ go build -o covergen ./cmd/covergen
+```
+
+## It has wasm!
+
+```
+$ make wasm
+```
+