feat: improve error handling, some docs, stubs

stubs.go

@@ -0,0 +1,22 @@
+package oidclogin
+
+import "github.com/gin-gonic/gin"
+
+func startStubs(r *gin.Engine) {
+	r.GET("/auth/v2/login", func(ctx *gin.Context) {
+		redir := ctx.Query("returnTo")
+		if redir != "" {
+			ctx.Redirect(307, redir)
+		} else {
+			ctx.Redirect(307, defaultRedirect)
+		}
+	})
+	r.GET("/auth/v2/verify", func(ctx *gin.Context) {
+		redir := ctx.Query("returnTo")
+		if redir != "" {
+			ctx.Redirect(307, redir)
+		} else {
+			ctx.Redirect(307, defaultRedirect)
+		}
+	})
+}