Impliment StartupTesting and started OAuth Server

Testing for IRC & Channels connection for debugging
OAuth Server (because it's better to roll my own for this)
internal/auth/oauth.go
tests/startup_checks.go

More tests to come for debugging

Plan to impliment Logging in internal/stoage/logs for internal & UI
debugging

internal/auth/oauth.go

@@ -0,0 +1,46 @@
+package oauth
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+)
+
+var (
+	clientID = os.Getenv("TWITCH_CLIENT_ID")
+	clientSecret = os.Getenv("TWITCH_CLIENT_SECRET")
+	redirectURI = "http://localhost:8080/callback"
+
+	scopes = []string{
+		"chat:read",
+		"chat:edit",
+		"channel:read:subscriptions",
+		"user:read:email",
+	}
+)
+
+type TokenResponse struct {
+	AccessToken string `json:"access_token"`
+	RefreshToken string `json:"refresh_token"`
+	ExpiresIn int `json:"expires_in"`
+	Scope []string `json:"scope"`
+	TokenType string `json:"token_type"`
+}
+
+// start http server for oauth login & callback
+func StartOAuthServer(addr string) error {
+	if clientID == "" || clientSecret == "" {
+		return fmt.Errorf("TWITCH_CLIENT_ID and TWITCH_CLIENT_SECRET must be set")
+	}
+
+	http.HandleFunc("/", handleIndex)
+	http.HandleFunc("/callback", handleCallback)
+
+	log.Printf("OAuth server listening on %s", addr)
+	return http.ListenAndServe(addr, nil)
+}
+