Added envvar configuration

src/config.rs

@@ -0,0 +1,12 @@
+use std::string::String;
+
+pub fn get_from_env(variable: &str, mandatory: bool) -> String {
+    std::env::var(variable).unwrap_or_else(|_| {
+        if mandatory {
+            println!("Error, couldn't read environment variable: {}", variable);
+            std::process::exit(1);
+        } else {
+            panic!("Error, couldn't read environment variable: {}", variable);
+        }
+    })
+}