florestad: Add lib.rs

This commit introduces a lib.rs for florestad. With this change, other softwares
can spawn a florestad process and run on the background.

florestad/src/lib.rs

@@ -0,0 +1,18 @@
+pub mod cli;
+pub mod config_file;
+pub mod error;
+pub mod json_rpc;
+pub mod run;
+pub mod slip132;
+pub mod wallet_input;
+use run::run_with_config;
+use run::Config;
+
+/// Start florestad and runs it
+///
+/// This method will spawn a `florestad` instance, initialize all the modules and services, and
+/// wait until florestad returns. This method shouldn't be called on your application's main
+/// thread, since it'll block while florestad is running.
+pub fn start_florestad(config: Config) {
+    run_with_config(config);
+}