Add prefix file

src/unit_systems/prefixes.rs

@@ -0,0 +1,18 @@
+#![allow(non_upper_case_globals, missing_docs)]
+pub const exa: f64 = 1e18;
+pub const peta: f64 = 1e15;
+pub const tera: f64 = 1e12;
+pub const giga: f64 = 1e9;
+pub const mega: f64 = 1e6;
+pub const kilo: f64 = 1e3;
+pub const hecto: f64 = 1e2;
+pub const deca: f64 = 1e1;
+
+pub const deci: f64 = 1e-1;
+pub const centi: f64 = 1e-2;
+pub const milli: f64 = 1e-3;
+pub const micro: f64 = 1e-6;
+pub const nano: f64 = 1e-9;
+pub const pico: f64 = 1e-12;
+pub const femto: f64 = 1e-15;
+pub const atto: f64 = 1e-18;