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

cipher_database/src/sqlite/mod.rs

@@ -0,0 +1,29 @@
+use diesel::Connection;
+use diesel::SqliteConnection;
+use diesel_async::pooled_connection::bb8::Pool;
+use diesel_async::pooled_connection::AsyncDieselConnectionManager;
+use diesel_migrations::embed_migrations;
+use diesel_migrations::EmbeddedMigrations;
+use diesel_migrations::MigrationHarness;
+use repository::SqliteRepositoryProvider;
+
+use crate::BackendError;
+
+pub mod repository;
+mod schema;
+
+const MIGRATIONS: EmbeddedMigrations = embed_migrations!("migrations/sqlite");
+
+pub fn run_pending_migrations(database_url: &str) -> Result<(), BackendError> {
+    let mut connection = SqliteConnection::establish(database_url)?;
+    connection
+        .run_pending_migrations(MIGRATIONS)
+        .map_err(BackendError::DieselMigrationError)?;
+    Ok(())
+}
+
+pub async fn repository_provider(database_url: &str) -> Result<SqliteRepositoryProvider, BackendError> {
+    let config = AsyncDieselConnectionManager::new(database_url);
+    let pool = Pool::builder().build(config).await?;
+    Ok(SqliteRepositoryProvider::new(pool))
+}