[Docs] Add guide for local development

docs/pages/usage/local_dev_guide.md

@@ -0,0 +1,93 @@
+---
+layout: page
+title: Local Development Guide
+permalink: /pages/usage/local-dev-guide/
+weight: 105
+---
+
+## Prerequisites
+
+- [Python 3.9+](https://www.python.org/downloads/)
+- [Node.js 18+](https://nodejs.org/)
+- [pnpm](https://pnpm.io/installation)
+
+---
+
+## Setup
+
+**Create a virtual environment (if required):**
+
+- ```bash
+  python -m venv .venv
+  ```
+
+**Activate venv:**
+
+- PowerShell
+
+  ```powershell
+  .\.venv\Scripts\Activate.ps1
+  ```
+
+- Bash
+
+  ```bash
+  source .venv/bin/activate
+  ```
+
+## API (Backend)
+
+Set environment variables (while the virtual environment is active):
+
+- PowerShell
+
+  ```powershell
+  # Replace <USER_HOME> with your user folder or path to the repos
+  $env:AAZ_PATH = "<USER_HOME>/aaz"
+  $env:AAZ_SWAGGER_PATH = "<USER_HOME>/azure-rest-api-specs"
+  $env:AAZ_SWAGGER_MODULE_PATH = "<USER_HOME>/azure-rest-api-specs/specification"
+  $env:AAZ_CLI_PATH = "<USER_HOME>/azure-cli"
+  $env:AAZ_CLI_EXTENSION_PATH = "<USER_HOME>/azure-cli-extensions"
+
+  $env:FLASK_APP="aaz_dev.app.app:create_app"
+  ```
+
+- Bash
+
+  ```bash
+  # Replace <USER_HOME> with your user folder or path to the repos
+  export AAZ_PATH="<USER_HOME>/aaz"
+  export AAZ_SWAGGER_PATH="<USER_HOME>/azure-rest-api-specs"
+  export AAZ_SWAGGER_MODULE_PATH="<USER_HOME>/azure-rest-api-specs/specification"
+  export AAZ_CLI_PATH="<USER_HOME>/azure-cli"
+  export AAZ_CLI_EXTENSION_PATH="<USER_HOME>/azure-cli-extensions"
+
+  export FLASK_APP="aaz_dev.app.app:create_app"
+  ```
+
+**Start application:**
+
+- ```
+  flask run --reload --port 5000
+  ```
+
+## Frontend:
+
+- Install dependencies
+
+  ```
+  pnpm install
+  pnpm build:typespec
+  pnpm build:web
+  pnpm run bundle
+
+
+  cd src/web
+  pnpm install
+  ```
+
+- Run front-end dev server (from `src/web`)
+
+  ```
+  pnpm run dev
+  ```