Add ACR Build and Push Guide documentation

Author: NirajC-Microsoft

docs/ACRBuildAndPushGuide.md

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+# Azure Container Registry (ACR) – Build & Push Guide
+
+This guide provides step-by-step instructions to build and push Docker images for **WebApp** and **Backend** services into Azure Container Registry (ACR).
+
+## 📋 Prerequisites
+Before starting, ensure you have:
+- An active [Azure Subscription](https://portal.azure.com/)
+- [Azure CLI](https://learn.microsoft.com/en-us/cli/azure/install-azure-cli) installed and logged in
+- [Docker](https://docs.docker.com/get-docker/) installed and running
+- Access to your Azure Container Registry (ACR)
+
+---
+
+## 🚀 Build and Push Images
+
+Login to ACR :
+``` bash
+az acr login --name $ACR_NAME
+```
+Command Build and Push Images to Backend : 
+ 
+ ```bash 
+ az acr login --name <containerregname>
+docker build --no-cache -f docker/Frontend.Dockerfile -t <acrloginserver>/<repo>:<tagname> .
+docker push <acrloginserver>/<repo>:<tagname>
+ ```
+
+## ✅ Verification
+
+Run the following command to verify that images were pushed successfully:
+```bash
+az acr repository list --name $ACR_NAME --output table
+```
+
+You should see repositories in the output.
+
+## 📝 Notes
+
+- Always use meaningful tags (v1.0.0, staging, prod) instead of just latest.
+
+- If you are pushing from a CI/CD pipeline, make sure the pipeline agent has access to Docker and ACR.
+
+- For private images, ensure your services (e.g., Azure Container Apps, AKS, App Service) are configured with appropriate ACR pull permissions.
+
+
+