add: post warnings

crates/core/src/model/communities.rs

@@ -178,6 +178,8 @@ pub struct PostContext {
     pub answering: usize,
     #[serde(default = "default_reactions_enabled")]
     pub reactions_enabled: bool,
+    #[serde(default)]
+    pub content_warning: String,
 }
 
 fn default_comments_enabled() -> bool {
@@ -204,6 +206,7 @@ impl Default for PostContext {
             repost: None,
             answering: 0,
             reactions_enabled: default_reactions_enabled(),
+            content_warning: String::new(),
         }
     }
 }