Create client to establish connection with discord and add basic framework with sample command

cipher_database/src/sqlite/repository/mod.rs

@@ -0,0 +1,50 @@
+use diesel::SqliteConnection;
+use diesel_async::pooled_connection::bb8::Pool;
+use diesel_async::pooled_connection::bb8::PooledConnection;
+use diesel_async::sync_connection_wrapper::SyncConnectionWrapper;
+use cipher_core::repository::Repository;
+use cipher_core::repository::RepositoryError;
+use cipher_core::repository::RepositoryProvider;
+
+use crate::BackendError;
+
+mod user_repository;
+
+pub struct SqliteRepository<'a> {
+    conn: PooledConnection<'a, SyncConnectionWrapper<SqliteConnection>>,
+}
+
+impl<'a> SqliteRepository<'a> {
+    pub fn new(conn: PooledConnection<'a, SyncConnectionWrapper<SqliteConnection>>) -> Self {
+        Self { conn }
+    }
+}
+
+impl Repository for SqliteRepository<'_> {
+    type BackendError = BackendError;
+}
+
+pub struct SqliteRepositoryProvider {
+    pool: Pool<SyncConnectionWrapper<SqliteConnection>>,
+}
+
+impl SqliteRepositoryProvider {
+    pub fn new(pool: Pool<SyncConnectionWrapper<SqliteConnection>>) -> Self {
+        Self { pool }
+    }
+}
+
+#[async_trait::async_trait]
+impl RepositoryProvider for SqliteRepositoryProvider {
+    type BackendError = BackendError;
+
+    type Repository<'a> = SqliteRepository<'a>;
+
+    async fn get(&self) -> Result<Self::Repository<'_>, RepositoryError<Self::BackendError>> {
+        self.pool
+            .get()
+            .await
+            .map(SqliteRepository::new)
+            .map_err(|err| RepositoryError(BackendError::from(err)))
+    }
+}