Add string customization and example.env

strings/en.json

@@ -0,0 +1,10 @@
+{
+	"WELCOME": "Beep boop. I'm a bot. Hi.",
+	"USER_JOINED": "%s joined the channel.",
+	"USER_LEFT": "%s left the channel.",
+	"SYSTEM_VOICE_CHANGED": "My new voice is %s from %s",
+	"USER_VOICE_CHANGED": "Your new voice is %s from %s",
+	"INVALID_ENGINE": "%s is not a valid engine name.",
+	"INVALID_VOICE": "invalid voice name. Using default voice %s for %s instead.",
+	"TOO_MANY_ARGUMENTS": "too many arguments for command."
+}