adding tool and tests

go.mod

@@ -0,0 +1,19 @@
+module web-to-markdown
+
+go 1.25.0
+
+require (
+	codeberg.org/readeck/go-readability/v2 v2.1.1
+	github.com/JohannesKaufmann/html-to-markdown v1.6.0
+	github.com/PuerkitoBio/goquery v1.12.0
+	golang.org/x/sync v0.20.0
+)
+
+require (
+	github.com/andybalholm/cascadia v1.3.3 // indirect
+	github.com/araddon/dateparse v0.0.0-20210429162001-6b43995a97de // indirect
+	github.com/go-shiori/dom v0.0.0-20230515143342-73569d674e1c // indirect
+	github.com/gogs/chardet v0.0.0-20211120154057-b7413eaefb8f // indirect
+	golang.org/x/net v0.52.0 // indirect
+	golang.org/x/text v0.35.0 // indirect
+)