Add documented patch series and build instructions

patches/0003-Replace-gets-with-fgets.patch

@@ -0,0 +1,44 @@
+From 789c2d97f672fd25cb0f5495892f13eda9fef440 Mon Sep 17 00:00:00 2001
+From: Christoph <ckubu@oopen.de>
+Date: Sun, 14 Dec 2025 11:49:00 +0100
+Subject: [PATCH 3/4] Replace gets() with fgets()
+
+---
+ src/mtest/mtest.c | 7 +++++--
+ 1 file changed, 5 insertions(+), 2 deletions(-)
+
+diff --git a/src/mtest/mtest.c b/src/mtest/mtest.c
+index 69af568..c15a853 100644
+--- a/src/mtest/mtest.c
++++ b/src/mtest/mtest.c
+@@ -38,6 +38,7 @@
+ #include <signal.h>
+ #include "c-client.h"
+ #include "imap4r1.h"
++#include <string.h>
+ 
+ /* Excellent reasons to hate ifdefs, and why my real code never uses them */
+ 
+@@ -595,7 +596,8 @@ void status (MAILSTREAM *stream)
+ void prompt (char *msg,char *txt)
+ {
+   printf ("%s",msg);
+-  gets (txt);
++  if (!fgets (txt, sizeof (txt), stdin)) txt[0] = '\0';
++  txt[strcspn (txt, "\r\n")] = '\0';
+ }
+ 
+ /* Interfaces to C-client */
+@@ -779,7 +781,8 @@ void smtptest (long debug)
+   puts (" Msg (end with a line with only a '.'):");
+   body->type = TYPETEXT;
+   *text = '\0';
+-  while (gets (line)) {
++  while (fgets (line, sizeof (line), stdin)) {
++    line[strcspn (line, "\r\n")] = '\0';
+     if (line[0] == '.') {
+       if (line[1] == '\0') break;
+       else strcat (text,".");
+-- 
+2.47.3
+