Create initial project structure

The initial project structure includes the base scaffolding of the
application as well as the ability to fetch the repo list from the
remote endpoint.

src/config.rs

@@ -0,0 +1,28 @@
+use crate::error::ConfigError;
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::Path;
+use url::Url;
+
+#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize)]
+pub struct Config {
+    pub registry_url: Url,
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            registry_url: Url::parse("https://localhost:5000").unwrap(),
+        }
+    }
+}
+
+impl TryFrom<&Path> for Config {
+    type Error = ConfigError;
+
+    fn try_from(path: &Path) -> Result<Self, Self::Error> {
+        let contents = fs::read_to_string(path)?;
+        let config: Self = toml::from_str(&contents)?;
+        Ok(config)
+    }
+}