Add INSTALLING section to README

README.7

@@ -7,8 +7,8 @@
 .Nd IRC client
 .
 .Sh DESCRIPTION
-.Nm
-is a TLS-only curses IRC client.
+.Xr catgirl 1
+is a TLS-only terminal IRC client.
 .
 .Ss Notable Features
 .Bl -bullet
@@ -72,6 +72,22 @@ TLS is now ubiquitous
 and certificates are easy to obtain.
 .El
 .
+.Sh INSTALLING
+.Nm
+requires LibreSSL
+.Pq Fl ltls
+and ncurses
+.Pq Fl lncursesw .
+It primarily targets
+.Fx
+and macOS,
+as well as Linux.
+.Bd -literal -offset indent
+\&./configure
+make all
+sudo make install PREFIX=/usr/local
+.Ed
+.
 .Sh FILES
 .Bl -tag -width "complete.c" -compact
 .It Pa chat.h