Add warning about using <ForisForm /> component in plugins.

README.md

@@ -16,3 +16,20 @@ tagged `beta`. Versions names are based on commit SHA, e.g.
 unnecessary version
 3. Create a merge request from `dev` to `master` branch
 4. New version should be published automatically
+
+## Manually managed dependencies
+Because of `<ForisForm />` component it's required to use exposed `ReactRouterDOM`
+object from `react-router-dom` library. `ReactRouterDOM` is exposed by
+[reForis](https://gitlab.labs.nic.cz/turris/reforis/reforis/blob/master/js/webpack.config.js).
+It can be done by following steps:
+ 
+1. Setting `react-router-dom` as `peerDependencies` and `devDependencies` in `package.json`.
+2. Adding the following rules to `externals` in `webpack.conf.js` of the plugin:
+
+```js
+externals: {
+    ...
+    "react-router-dom": "ReactRouterDOM",
+}
+```
+

src/form/components/ForisForm.js

@@ -73,7 +73,12 @@ ForisForm.defaultProps = {
     disabled: false,
 };
 
-/** Serves as HOC for all foris forms components. */
+/** Serves as HOC for all foris forms components.
+ *
+ * As `<Prompt />` from `react-router-dom` is used in this component then it required to
+ * use exposed `ReactRouterDOM` object from `react-router-dom` library which is exposed by reForis.
+ * See README for more information.
+ * */
 export function ForisForm({
     ws,
     forisConfig,