Add vendor (steam)

vendor/github.com/Philipp15b/go-steam/community/community.go

@@ -0,0 +1,35 @@
+package community
+
+import (
+	"net/http"
+	"net/http/cookiejar"
+	"net/url"
+)
+
+const cookiePath = "https://steamcommunity.com/"
+
+func SetCookies(client *http.Client, sessionId, steamLogin, steamLoginSecure string) {
+	if client.Jar == nil {
+		client.Jar, _ = cookiejar.New(new(cookiejar.Options))
+	}
+	base, err := url.Parse(cookiePath)
+	if err != nil {
+		panic(err)
+	}
+	client.Jar.SetCookies(base, []*http.Cookie{
+		// It seems that, for some reason, Steam tries to URL-decode the cookie.
+		&http.Cookie{
+			Name:  "sessionid",
+			Value: url.QueryEscape(sessionId),
+		},
+		// steamLogin is already URL-encoded.
+		&http.Cookie{
+			Name:  "steamLogin",
+			Value: steamLogin,
+		},
+		&http.Cookie{
+			Name:  "steamLoginSecure",
+			Value: steamLoginSecure,
+		},
+	})
+}