docs: add multiple selection docs (#1875)

src/components/ShortcutsDialog.tsx

@@ -259,6 +259,12 @@ export const ShortcutsDialog = ({ onClose }: { onClose?: () => void }) => {
                 label={t("labels.selectAll")}
                 shortcuts={[getShortcutKey("CtrlOrCmd+A")]}
               />
+              <Shortcut
+                label={t("labels.multiSelect")}
+                shortcuts={[
+                  getShortcutKey(`Shift+${t("shortcutsDialog.click")}`),
+                ]}
+              />
               <Shortcut
                 label={t("labels.moveCanvas")}
                 shortcuts={[

src/locales/en.json

@@ -2,6 +2,7 @@
   "labels": {
     "paste": "Paste",
     "selectAll": "Select all",
+    "multiSelect": "Add element to selection",
     "moveCanvas": "Move canvas",
     "copy": "Copy",
     "copyAsPng": "Copy to clipboard as PNG",