Add guild NSFW level (#1029)

* Add guild NSFW level

* Fix typo

* fix(structs): typo

Co-authored-by: nitroflap <fe.lap.prog@gmail.com>

structs.go

@@ -552,6 +552,17 @@ const (
 	ExplicitContentFilterAllMembers          ExplicitContentFilterLevel = 2
 )
 
+// GuildNSFWLevel type definition
+type GuildNSFWLevel int
+
+// Constants for GuildNSFWLevel levels from 0 to 3 inclusive
+const (
+	GuildNSFWLevelDefault       GuildNSFWLevel = 0
+	GuildNSFWLevelExplicit      GuildNSFWLevel = 1
+	GuildNSFWLevelSafe          GuildNSFWLevel = 2
+	GuildNSFWLevelAgeRestricted GuildNSFWLevel = 3
+)
+
 // MfaLevel type definition
 type MfaLevel int
 
@@ -675,6 +686,9 @@ type Guild struct {
 	// The explicit content filter level
 	ExplicitContentFilter ExplicitContentFilterLevel `json:"explicit_content_filter"`
 
+	// The NSFW Level of the guild
+	NSFWLevel GuildNSFWLevel `json:"nsfw_level"`
+
 	// The list of enabled guild features
 	Features []string `json:"features"`