Add README

Signed-off-by: Tim Foerster <tim.foerster@hetzner.de>

README.md

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+# MTR
+
+A MTR implementation written in golang, completly without shell-execs.
+
+**Note: This tool mayby called with sudo or as root, because it will open raw sockets.**
+
+## Output
+
+*Currently there is no support for non ipv4 targets*
+
+```
+HOP:    Address                Loss%  Sent    Last     Avg    Best   Worst                                             Packets
+  1:|-- 10.200.1.1              0.0%     6     1.4     1.8     1.2     3.2                                               .....
+  2:|-- 192.168.2.1             0.0%     6     3.3     3.1     2.4     3.5                                               .....
+  3:|-- 62.155.247.163          0.0%     6    10.9    11.6    10.9    12.6                                               .....
+  4:|-- 217.5.95.170            0.0%     6    24.5    24.9    24.5    26.0                                               .....
+  5:|-- 72.14.194.156           0.0%     6    23.9    25.1    23.2    30.4                                               .....
+  6:|-- ???                   100.0%     6     0.0     0.0     0.0     0.0                                               ?????
+  7:|-- 209.85.142.128          0.0%     6    24.5    24.9    23.6    25.8                                               .....
+  8:|-- 108.170.227.227         0.0%     6    25.4    25.6    24.0    30.0                                               .....
+  9:|-- 8.8.8.8                 0.0%     5    23.9    24.2    23.6    25.0                                                ....
+```
+
+## Usage
+
+```
+Usage:
+  mtr TARGET [flags]
+
+Flags:
+      --buffer-size int     Cached packet buffer size (default 50)
+  -c, --count int           Amount of pings per target (default 5)
+  -h, --help                help for mtr
+  -i, --interval duration   Wait time between icmp packets before sending new one (default 100ms)
+      --max-hops int        Maximal TTL count (default 64)
+  -t, --timeout duration    ICMP reply timeout (default 800ms)
+```
+