Add readme & screenshot

readme.md

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+# Toast
+
+A go package for Windows 10 toast notifications.
+
+As seen in [jacobmarshall/pokevision-cli](https://github.com/jacobmarshall/pokevision-cli).
+
+## Screenshot
+
+![Screenshot](./screenshot.png)
+
+## Example
+
+```
+package main
+
+import (
+    toast "github.com/jacobmarshall/go-toast"
+    "log"
+)
+
+func main() {
+    notification := toast.Notification{
+        AppID: "Example App",
+        Title: "My notification",
+        Message: "Some message about how important something is...",
+        Icon: "go.png",
+        Actions: []toast.Action{
+            {"protocol", "I'm a button"},
+            {"protocol", "Me too!"},
+        },
+    }
+    err := notification.Push()
+    if err != nil {
+        log.Fatalln(err)
+    }
+}
+```