database handling moved to subdir (db)

* lib.rs: update local name bindings and module path (use, pub mod)
* db/mod.rs: functions, tests
* db/schemas: database schemas created via diesel
* db/models: types und enums generated for db handling
* db/types: traits and implementations te serialize, deserialize

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

src/lib.rs

@@ -1,9 +1,26 @@
+/*
+ * advotracker - Hotline tackingtool for Advocats
+ *
+ * Copyright 2019 Ralf Zerres <ralf.zerres@networkx.de>
+ * SPDX-License-Identifier: 0BSD, MIT
+ */
+
+extern crate chrono;
+extern crate dotenv;
+#[macro_use]
+extern crate diesel;
+#[macro_use]
+extern crate serde_derive;
+extern crate serde_json;
+
+pub mod db;
+
 // This function adds two integers (given as arguments) and returns the sum.
 //
 // # Examples
 //
 // ```
-// assert_eq!(8, advotracker::internal_adder(4, 4));
+// assert_eq!(8, advotracker_backend::internal_adder(4, 4));
 // ```
 
 fn internal_adder(a: i32, b: i32) -> i32 {