docs: add docs for validating OUI changes in OpenSearch-Dashboards

DEVELOPER_GUIDE.md

@@ -61,5 +61,6 @@ yarn start --port 9000
 * [Theming](wiki/theming.md)
 * [Testing](wiki/testing.md)
   * [Accessibility Testing](wiki/automated-accessibility-testing.md)
+  * [Validating with OpenSearch Dashboards](wiki/validating-with-opensearch-dashboards.md)
 * [Documentation](wiki/documentation-guidelines.md)
 * [Releasing versions](wiki/releasing-versions.md)

wiki/validating-with-opensearch-dashboards.md

@@ -0,0 +1,35 @@
+# Validating with OpenSearch Dashboards
+
+The following are instructions for locally validating OUI changes within the 
+[OpenSearch Dashboards](https://github.com/opensearch-project/OpenSearch-Dashboards) 
+project.
+
+## Instructions
+
+To consume local OUI artifacts in OpenSearch Dashboards, and because there are 
+some blockers to using `npm link` right now,`package.json` references to 
+`opensearch-project/oui` will need to be updated to point to your local repo 
+by running the following in `opensearch-project/OpenSearch-Dashboards`:
+
+```bash
+# Replace `<PATH TO>` below with a valid path to OUI
+find . -type f -name package.json -exec sed -i 's/"@elastic\/eui": ".*"/"@elastic\/eui": "file:\/<PATH TO>\/oui"/g' {} \;
+```
+
+To see changes in OUI be reflected in Dashboards, first build release 
+artifacts in `opensearch-project/oui`:
+
+```bash
+yarn build
+```
+
+Then update OpenSearch Dashboards to consume them and restart your server by 
+running the following in `opensearch-project/OpenSearch-Dashboards`:
+
+```bash
+yarn osd clean
+yarn osd bootstrap
+yarn start
+```
+
+Changes from OUI should now be available in your local OpenSearch Dashboards server!