Add README

README.md

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+# Trikotwaschliste
+
+Website: [https://deizisauer-waschweiber.de/](https://deizisauer-waschweiber.de/)
+
+## Building
+
+```sh
+go build
+```
+
+## Upgrade vendor dependencies
+
+To update your local dependencies use the following command inside the root of this project:
+```sh
+go get -u -t ./...
+```
+This will update the `go.mod` and `go.sum` file. To get the dependencies inside the vendor folder use:
+```sh
+go mod tidy
+go mod vendor
+```