updates models, adds rusty_money crate dependency

Cargo.toml

@@ -6,4 +6,5 @@ edition = "2021"
 [dependencies]
 tokio = { version = "1.2", features = ["full"] }
 warp = "0.3"
+rusty-money = "0.4.1"
 

MODELS.md

@@ -22,6 +22,7 @@ struct Person {
     handle: Option<String>,
     email: Option<Vec<String>>,
     is_active: bool,
+    is_blocked: bool,
     created_at: chrono::DateTime,
     modified_at: chrono::DateTime,
     modified_by: PersonId,
@@ -98,6 +99,7 @@ struct Track {
     duration: chrono::Duration,
     artists: HashMap<Artist>,
     is_public: bool,
+    is_available: bool,
     preview_source: Option<String>,
     source: String,
     price: Option<rusty_money::Money>,
@@ -130,6 +132,7 @@ struct Album {
     artists: HashMap<Artist>,
     tracks: HashMap<Track>,
     is_public: bool,
+    is_available: bool,
     preview_source: Option<String>,
     source: String,
     price: Option<rusty_money::Money>,
@@ -233,6 +236,48 @@ struct Comment {
 }
 ```
 
+# Collection
+
+A Collection represents one or more Albums and/or Tracks that are offered together as a package for Purchase
+
+``` rust
+struct CollectionId {
+    id: String,
+}
+struct Collection {
+    id: CollectionId,
+    name: String,
+    description: String,
+    created_by: Person,
+    created_at: chrono::DateTime,
+    modified_by: Person,
+    modified_at: chrono::DateTime,
+    is_public: bool,
+    is_available: bool,
+    deleted_by: Option<Person>,
+    deleted_at: Option<chrono::DateTime>,
+    albums: Option<Vec<Album>>,
+    tracks: Option<Vec<Track>>,
+    price: Oprion<rusty_money::Money>,
+}
+```
+
+# OtherProduct
+
+An OtherProduct represents a product that is not a Track, Album, or Collection that is nonetheless for sale as a Purchase.
+
+``` rust
+struct OtherProductId {
+    id: String,
+}
+struct OtherProduct {
+    id: OtherProductId,
+    name: String,
+    description: String,
+
+}
+```
+
 # Purchase
 
 A Purchase represents one or more Tracks or Albums that a Person purchases from an Artist or Label through the server.
@@ -264,8 +309,20 @@ struct PurchaseItem {
     quantity: usize,
     discount_percentage: usize,
 }
+enum PurchaseState {
+    InCart,
+    Processing,
+    PaymentRejected,
+    PaymentCompleted,
+    Fulfilled,
+    Cancelled,
+    Refunded,
+}
 struct Purchase {
     id: String,
-
+    items: Vec<PurchaseItem>,
+    state: PurchaseState,
+    purchased_by: Person,
+    purchased_at: Option<chrono::DateTime>,
 }
 ```