Add basic models

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

src/models/context.rs

@@ -0,0 +1,17 @@
+use serde::{Deserialize, Serialize};
+
+use crate::time::Timestamp;
+
+#[derive(Serialize, Deserialize)]
+pub struct Context {
+    /// Redis DB to use
+    id: u32,
+    /// Actor ids which have admin rights on this context
+    admins: Vec<u32>,
+    /// Actor ids which can read the context info
+    readers: Vec<u32>,
+    /// Actor ids which can execute jobs in this context
+    executors: Vec<u32>,
+    created_at: Timestamp,
+    upddated_at: Timestamp,
+}