Add Proxmox/HA-CoroSync.md

Proxmox/HA-CoroSync.md

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+# Helpfull Stuff about CoroSync / HA-Cluster in Proxmox
+
+## 2 Node Cluster without QDevice as the 3rd node
+
+Use this snipped as a cronjob to set the needed votes to only 1 to bring up a host.
+This is an example where Host A (IP 10.0.81.1) is trying to ping Host B (IP 10.0.81.2). If this host is not reachable then set the expected votes to 1.
+
+```python
+*  *  *  *  *  if ! ping -c1 -w1 10.0.81.2 > /dev/null; then pvecm expected 1; fi
+```