Added issue template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,46 @@
+---
+name: Bug report
+about: There is a problem with the WireGuard package
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Description**
+Brief description of what you are trying to do, and what actually happens.
+
+**Steps to reproduce**
+```
+$ ssh user@nas
+$ sudo wg-quick up wg0
+[#] ip link add wg0 type wireguard
+[#] wg setconf wg0 /dev/fd/63
+[#] ip -4 address add 10.0.0.2/16 dev wg0
+[#] ip link set mtu 1270 up dev wg0
+[#] wg set wg0 fwmark 51820
+[#] ip -4 route add 0.0.0.0/0 dev wg0 table 51820
+[#] ip -4 rule add not fwmark 51820 table 51820
+[#] ip -4 rule add table main suppress_prefixlength 0
+[#] sysctl -q net.ipv4.conf.all.src_valid_mark=1
+[#] nft -f /dev/fd/63
+$ sudo wg show
+interface: wg0
+  public key: <redacted>
+  private key: (hidden)
+  listening port: 25565
+  fwmark: 0xca6c
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Synology NAS model**
+E.g. DS218j
+
+**wg0.conf**
+```
+Content of wg0.conf goes here. Remember to redact Private keys!
+```
+
+If there are multiple peers, include their configuration too.