Initial commit of modash

This was taken from github.com/lmika/gopkgs/fp

momap/keys.go

@@ -0,0 +1,9 @@
+package momap
+
+func Keys[K comparable, V any](m map[K]V) []K {
+	ks := make([]K, 0, len(m))
+	for k := range m {
+		ks = append(ks, k)
+	}
+	return ks
+}