Added Wiki for all the docs from Egor

zzzEgor/Proxmox/LXC/Update.md

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+### Code:
+
+```
+#!/bin/bash
+# update all containers
+
+# list of container ids we need to iterate through
+containers=$(pct list | tail -n +2 | cut -f1 -d' ')
+
+function update_container() {
+  container=$1
+  echo "[Info] Updating $container"
+  # to chain commands within one exec we will need to wrap them in bash
+  pct exec $container -- bash -c "apt update && apt upgrade -y && apt autoremove -y"
+}
+
+for container in $containers
+do
+  status=`pct status $container`
+  if [ "$status" == "status: stopped" ]; then
+    echo [Info] Starting $container
+    pct start $container
+    echo [Info] Sleeping 5 seconds
+    sleep 5
+    update_container $container
+    echo [Info] Shutting down $container
+    pct shutdown $container &
+  elif [ "$status" == "status: running" ]; then
+    update_container $container
+  fi
+done; wait
+```