docs: update md files

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,18 @@
+---
+name: Feature request
+about: Suggest an idea for a new feature in CoreUI Free Vue Admin Template.
+title: ''
+labels: feature
+assignees: ''
+
+---
+
+Before opening:
+
+- [Search for duplicate or closed issues](https://github.com/coreui/coreui-free-vue-admin-template/issues?utf8=%E2%9C%93&q=is%3Aissue)
+- Read the [contributing guidelines](https://github.com/coreui/coreui-free-vue-admin-template/blob/main/.github/CONTRIBUTING.md)
+
+Feature requests must include:
+
+- As much detail as possible for what we should add and why it's important to Bootstrap
+- Relevant links to prior art, screenshots, or live demos whenever possible