Add basic posts struct

src/lib.rs

@@ -1 +1,2 @@
 mod client;
+mod post;

src/post.rs

@@ -0,0 +1,40 @@
+pub type Id = u64;
+pub type FileSize = u64;
+pub type ImageDimension = u64;
+
+pub struct Post {
+    id: Id,
+    created_at: String,
+    updated_at: String,
+    tags: PostTags, 
+    file: PostFile,
+    rating: String,
+    fav_count: u16,
+    sources: Vec<String>,
+    approver_id: Id,
+    uploader_ud: Id,
+    description: String,
+    comment_count: u16,
+    has_notes: bool,
+    is_favorited: bool,
+    change_seq: u128
+}
+
+pub struct PostTags {
+    general: Vec<String>,
+    artist: Vec<String>,
+    copyright: Vec<String>,
+    character: Vec<String>,
+    invalid: Vec<String>,
+    meta: Vec<String>,
+    lore: Vec<String>
+}
+
+pub struct PostFile {
+    width: ImageDimension,
+    height: ImageDimension,
+    ext: String,
+    size: FileSize,
+    md5: String,
+    url: String
+}