Add discordgo starter (#178)

* Added discordgo starter

* Removed unnecessary check

examples/discordgo/.gitignore

@@ -0,0 +1,15 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/

examples/discordgo/README.md

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+---
+title: Discord Golang bot
+description: A Discord bot written in Golang
+tags:
+- discordgo
+- golang
+---
+
+# DiscordGo Example
+
+This example starts a Discord bot using [discordgo](https://github.com/bwmarrin/discordgo) and [Golang](https://golang.org/).
+
+[![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/new?template=https%3A%2F%2Fgithub.com%2Frailwayapp%2Fexamples%2Ftree%2Fmaster%2Fexamples%2Fdiscordgo&envs=DISCORD_TOKEN&DISCORD_TOKENDesc=Token+of+your+Discord+bot)
+
+## ✨ Features
+
+- DiscordGo
+- Golang
+
+## 💁‍♀️ How to use
+
+- Install dependencies `go mod download`
+- Connect to your Railway project `railway link`
+- Start the bot `railway run go run main.go`
+
+## 📝 Notes
+
+The server started launches a Discord bot with a couple of basic commands. The code is located at `main.go`.

examples/discordgo/go.mod

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+module github.com/railwayapp/starters/examples/discordgo
+
+go 1.16
+
+require github.com/bwmarrin/discordgo v0.23.2 // indirect

examples/discordgo/go.sum

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+github.com/bwmarrin/discordgo v0.23.2 h1:BzrtTktixGHIu9Tt7dEE6diysEF9HWnXeHuoJEt2fH4=
+github.com/bwmarrin/discordgo v0.23.2/go.mod h1:c1WtWUGN6nREDmzIpyTp/iD3VYt4Fpx+bVyfBG7JE+M=
+github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
+github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
+golang.org/x/crypto v0.0.0-20181030102418-4d3f4d9ffa16 h1:y6ce7gCWtnH+m3dCjzQ1PCuwl28DDIc3VNnvY29DlIA=
+golang.org/x/crypto v0.0.0-20181030102418-4d3f4d9ffa16/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=

examples/discordgo/main.go

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+package main
+
+import (
+	"fmt"
+	"github.com/bwmarrin/discordgo"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func main() {
+	// Create a new session using the DISCORD_TOKEN environment variable from Railway
+	dg, err := discordgo.New("Bot " + os.Getenv("DISCORD_TOKEN"))
+	if err != nil {
+		fmt.Printf("Error while starting bot: %s", err)
+		return
+	}
+
+	// Add the message handler
+	dg.AddHandler(messageCreate)
+
+	// Add the Guild Messages intent
+	dg.Identify.Intents = discordgo.IntentsGuildMessages
+
+	// Connect to the gateway
+	err = dg.Open()
+	if err != nil {
+		fmt.Printf("Error while connecting to gateway: %s", err)
+		return
+	}
+
+	// Wait until Ctrl+C or another signal is received
+	fmt.Println("The bot is now running. Press Ctrl+C to exit.")
+	sc := make(chan os.Signal, 1)
+	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt, os.Kill)
+	<-sc
+
+	// Close the Discord session
+	dg.Close()
+}
+
+func messageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {
+	// Don't proceed if the message author is a bot
+	if m.Author.Bot {
+		return
+	}
+
+	if m.Content == "ping" {
+		s.ChannelMessageSend(m.ChannelID, "Pong 🏓")
+		return
+	}
+
+	if m.Content == "hello" {
+		s.ChannelMessageSend(m.ChannelID, "Choo choo! 🚅")
+		return
+	}
+}