feat: move project to crates

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/como_core/src/users/mod.rs

@@ -0,0 +1,22 @@
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use como_domain::Context;
+
+pub type DynUserService = Arc<dyn UserService + Send + Sync>;
+
+#[async_trait]
+pub trait UserService {
+    async fn add_user(
+        &self,
+        context: &Context,
+        username: String,
+        password: String,
+    ) -> anyhow::Result<String>;
+    async fn validate_user(
+        &self,
+        context: &Context,
+        username: String,
+        password: String,
+    ) -> anyhow::Result<Option<String>>;
+}