github: provide an issue template

diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
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+This is an example of bug report. Try to adapt it to your case.
+
+# Bug description
+
+## Steps to reproduce the problem
+
+ 1. Compile `lldpd` with `./configure --localstatedir=/var --with-snmp && make`.
+
+ 2. Install with `sudo make install`.
+
+ 3. Run `lldpd`.
+ 
+ 4. Wait for a LLDPDU from the remote switch (vendor Pisco, release 19.1(478)KHT47.3).
+ 
+## Expected outcome
+
+`lldpd` should accept the LLDPDU and it should be available in the
+output of `lldpcli show neighbors`.
+
+## Current outcome
+
+After executing the above steps, `lldpd` crashed. Here is the end of
+the output of `lldpd -ddddd` before the crash:
+
+```
+2016-11-10T11:06:40 [ DBG/lldp] receive LLDP PDU on eno1
+2016-11-10T11:06:40 [ DBG/alloc] allocate a new management address (family: 1)
+2016-11-10T11:06:40 [ DBG/decode] search for the same MSAP
+2016-11-10T11:06:40 [ DBG/decode] MSAP is unknown, search for the chassis
+2016-11-10T11:06:40 [ DBG/decode] unknown chassis, add it to the list
+```
+
+# Additional information
+
+ - Output of `lldpd -vv`:
+ 
+```
+lldpd x.y.z
+  Built on ...
+  
+Additional LLDP features: ...
+Additional protocols: ...
+```
+
+ - Output of `ps -fp $(pgrep -d, -x lldpd)`:
+ 
+```
+UID        PID  PPID  C STIME TTY          TIME CMD
+root      2265     1  0 nov.05 ?       00:00:00 lldpd: monitor.
+_lldpd    2285  2265  0 nov.05 ?       00:00:00 lldpd: connected to gs108t.
+```
+
+ - Output of `uname -sro`:
+ 
+```
+Linux 4.8.0-1-amd64 GNU/Linux
+```