add licence terms to main.rs

1 files changed, 19 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 4cde172..e03d338 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,22 @@
+/*
+    eva - an easy to use calculator REPL similar to bc(1)
+    Copyright (C) 2019  Akshay Oppiliappan <[email protected]>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+ */
+
 use std::f64;
 use std::env;