Update README.md and license. Add examples

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

examples/client-on-request-completed/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/vartanbeno/go-reddit"
+)
+
+var ctx = context.Background()
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() (err error) {
+	withCredentials := reddit.WithCredentials("id", "secret", "username", "password")
+
+	client, err := reddit.NewClient(nil, withCredentials)
+	if err != nil {
+		return
+	}
+
+	client.OnRequestCompleted(logResponse)
+
+	client.Subreddit.Search(ctx, "programming", reddit.SetLimit(10))
+	client.Subreddit.SearchNames(ctx, "monitor")
+	client.Subreddit.SearchPosts(ctx, "react", "webdev", reddit.SortByNumberOfComments)
+	client.User.Posts(ctx, reddit.SetLimit(50))
+
+	return
+}
+
+func logResponse(req *http.Request, res *http.Response) {
+	fmt.Printf("%s %s %s\n", req.Method, req.URL, res.Status)
+}