Fix typo and add rust market links

Adds links to the rust meta extension and the VScode rust page

MODELS.md

@@ -185,7 +185,6 @@ struct Track {
     is_available: bool,
     preview_source: Option<String>,
     source: String,
-    price: Option<rusty_money::Money>,
     created_by: PersonId,
     created_at: chrono::DateTime,
     modified_by: PersonId,
@@ -218,7 +217,6 @@ struct Album {
     is_available: bool,
     preview_source: Option<String>,
     source: String,
-    price: Option<rusty_money::Money>,
     created_by: PersonId,
     created_at: chrono::DateTime,
     modified_by: PersonId,
@@ -289,23 +287,14 @@ struct Article {
 A Comment represents a textual comment that a Person wants to attach contextually to an Artist, an Album, a Track, or a Playlist.
 
 ``` rust
-enum CommentTargetType {
-    Label,
-    Artist,
-    Album,
-    Track,
-    Playlist,
-    Article,
-    Comment,
-}
-struct CommentTargetId {
-    label_id: Option<LabelId>,
-    artist_id: Option<ArtistId>,
-    album_id: Option<AlbumId>,
-    track_id: Option<TrackId>,
-    playlist_id: Option<PlaylistId>,
-    article_id: Option<ArticleId>,
-    comment_id: Option<CommentId>,
+enum CommentTarget {
+    Label(LabelId),
+    Artist(ArtistId),
+    Album(AlbumId),
+    Track(TrackId),
+    Playlist(PlaylistId),
+    Article(ArticleId),
+    Comment(CommentId),
 }
 struct CommentId {
     id: String,
@@ -313,8 +302,7 @@ struct CommentId {
 struct Comment {
     id: CommentId,
     body: String,
-    target_type: CommentTargetType,
-    target_id: CommentTargetId,
+    target: CommentTarget,
     created_by: PersonId,
     created_at: chrono::DateTime,
     modified_by: Option<PersonId>,
@@ -405,7 +393,6 @@ struct Collection {
     albums: Option<Vec<Album>>,
     tracks: Option<Vec<Track>>,
     other_products: Option<Vec<OtherProduct>>,
-    price: Option<rusty_money::Money>,
 }
 ```
 
@@ -429,7 +416,7 @@ struct OtherProduct {
     is_available: bool,
     deleted_by: Option<PersonId>,
     deleted_at: Option<chrono::DateTime>,
-    price: Option<rusty_money::Money>
+    requires_shipping: bool,
 }
 ```
 
@@ -439,10 +426,10 @@ A Purchase represents one or more Tracks or Albums that a Person purchases from
 
 ``` rust
 enum PurchaseItemType {
-    Album,
-    Track,
-    Collection,
-    OtherProduct,
+    Album(AlbumId),
+    Track(TrackId),
+    Collection(CollectionId),
+    OtherProduct(OtherProductId),
 }
 struct PurchaseItemId {
     id: String,
@@ -452,18 +439,15 @@ struct SkuId {
 }
 struct Sku {
     id: SkuId,
-    album_id: Option<AlbumId>,
-    track_id: Option<TrackId>,
-    collection_id: Option<CollectionId>,
-    other_product_id: Option<OtherProductId>,
+    item: PurchaseItemType,
     variant: Option<String>,
-    discount_percentage: Option<f64>,
-    discount_flatrate: Option<rusty_money::Money>,
+    description: Option<String>,
+    price: Option<rusty_money::Money>,
+    requires_shipping: bool,
 }
 struct PurchaseItem {
     id: PurchaseItemId,
-    type: PurchaseItemType,
-    sku: Option<SkuId>,
+    sku: SkuId,
     quantity: usize,
 }
 enum PurchaseState {
@@ -481,5 +465,35 @@ struct Purchase {
     state: PurchaseState,
     purchased_by: Person,
     purchased_at: Option<chrono::DateTime>,
+    fulfilled_by: Option<Person>,
+    fulfilled_at: Option<chrono::DateTime>,
 }
 ```
+
+# CouponCode
+
+A CouponCode represents a code a Person can enter to receive a discount on a PurchateItem or on a Purchase.
+
+``` rust
+struct CouponCodeId {
+    id: String,
+}
+struct CouponCode {
+    id: CouponCodeId,
+    name: String,
+    code: String,
+    uses: usize,
+    max_uses: usize,
+    expiration: Option<chrono::DateTime>,
+    discount_flat: Option<rusty_money::Money>,
+    discount_percentage: Option<f32>,
+    skus: Option<Vec<SkuId>>,
+    is_active: bool,
+    created_by: PersonId,
+    created_at: chrono::DateTime,
+    modified_by: PersonId,
+    modified_at: chrono::DateTime,
+    deleted_by: Option<PersonId>,
+    deleted_at: Option<chrono::DateTime>,
+}
+```