Add a makefile and readme

diff --git a/Makefile b/Makefile
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+netmon: main.c
+       $(CC) main.c -o netmon -lpcap -std=c99

diff --git a/Readme.txt b/Readme.txt
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+++ b/Readme.txt
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+netmon - a simple network connectivity monitor
+Copyright © 2008-2016 Mikko Rasa, Mikkosoft Productions
+
+Netmon keeps track of the machine's network connection status.  It can
+passively monitor network traffic with libpcap or actively ping a target
+machine.  It can also run an external command when the network goes down,
+for example to reset an ADSL modem in an effort to bring the connection
+back up.
+
+Command-line options:
+  -f
+    Run in foreground (by default netmon daemonizes itself)
+
+  -v
+    Be more verbose
+
+  -p HOST
+    Send a ping to HOST every second
+
+  -s NUM
+    Reports packet loss statistics every NUM seconds (default 1800, only
+    works if pinging is enabled)
+
+  -i NAME
+    Monitor packets on interface NAME
+
+  -c CMD
+    Run CMD if the connection goes down
+
+  -t NUM[,NUM]
+    Sets the delay and interval (in seconds) for running the trigger
+    command (default 60 and 600)