correct build status in readme, add devcontainer

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/ruby
+{
+	"name": "Ruby",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/ruby:1-3.3-bullseye"
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "ruby --version",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
+version: 2
+updates:
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly

README.md

@@ -1,7 +1,6 @@
 # Windows Remote Management (WinRM) for Ruby
-[![Build Status](https://travis-ci.org/WinRb/WinRM.svg?branch=master)](https://travis-ci.org/WinRb/WinRM)
+[![build](https://github.com/WinRb/WinRM/actions/workflows/build.yml/badge.svg)](https://github.com/WinRb/WinRM/actions/workflows/build.yml)
 [![Gem Version](https://badge.fury.io/rb/winrm.svg)](http://badge.fury.io/rb/winrm)
-[![Build status](https://ci.appveyor.com/api/projects/status/ods9tvos78k5c15h?svg=true)](https://ci.appveyor.com/project/winrb/winrm)
 
 This is a SOAP library that uses the functionality in Windows Remote
 Management(WinRM) to call native object in Windows.  This includes, but is