added local instance instructions

Author: dwarfered

README.md

@@ -4,6 +4,8 @@ Entra Explorer is an open-source solution that leverages Microsoft
 Graph to help administrators retrieve and visualize data from
 Microsoft Entra.
 
+[Entra Explorer](https://www.entraexplorer.com)
+
 ## Solution Overview
 
 The solution is a single-page application (SPA) hosted on GitHub Pages,
@@ -22,12 +24,38 @@ side.
 - All Enterprise Applications with assigned application roles.
 - All Enterprise Applications configured for SAML SSO, along with their expiration dates.
 
+## Running your own instance of Entra Explorer
+
+### Prerequisites
+
+- [Node.js](https://nodejs.org/en/download/)
+- [Next.js v14.2.16+](https://nextjs.org/docs/getting-started/installation)
+- [Visual Studio Code](https://code.visualstudio.com/download)
+- A modern web browser
+
+- Open ./lib/msalConfig.ts in an editor.
+- Replace ClientId and Authority for your created Entra Application Registration (Single-Page Application)
+
+### Installing dependencies
+```bash
+# Install dependencies from the root of the repo
+npm install
+```
+### Running the application
+```bash
+# Run locally
+npm run dev
+
+# Optionally build
+npm run build
+```
+
+Open http://localhost:3000 to view in your browser.
+
 ---
 
 Please note that Entra Explorer is not an official Microsoft product
 and is in no way affiliated with, endorsed by, or sponsored by
 Microsoft.
 
-[Entra Explorer](https://www.entraexplorer.com)
-
 [LinkedIn - Chris Dymond](https://au.linkedin.com/in/chris-dymond)