adding GPL

sshkeys/ref/format.ed25519

@@ -1,3 +1,21 @@
+#############################################################################
+    SSHSecure - a program to harden OpenSSH from defaults
+    Copyright (C) 2020  Brent Saner
+
+    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/>.
+#############################################################################
+
 ANNOTATED HEX REFERENCE:
 
 PRIVATE:
@@ -42,4 +60,4 @@ PUBLIC:
 0 uint32 allocator for 0.0
 	0.0 Public key keytype (string)
 1 uint32 allocator for 1.0
-	1.0 Public key payload (bytes)
+	1.0 Public key payload (bytes)