Update README.md (#254)

* Update README.md

Co-authored-by: Caleb Kiage <747955+calebkiage@users.noreply.github.com>

Author: CarolKigoonya

README.md

@@ -1,3 +1,79 @@
 # Microsoft Graph CLI
 
+## Required tools
+A commandline tool should work on any terminal. We recommend:
+- [Windows Terminal + version](https://apps.microsoft.com/store/detail/windows-terminal/9N0DX20HK701?hl=en-us&gl=us)
+- MacOS terminal
+- PowerShell version 7.3.2
+
+## Target project requirements
+Download the CLI SDK to get started for 
+Windows, Mac, or Linux here on the assets link of the latest release: [CLI SDK Download](https://github.com/microsoftgraph/msgraph-cli/releases)
+
+
+## Registering an application in Azure AD
+
+## Creating an application registration
+
+> **Note:** this step is required if your client will be calling APIs that are protected by the Microsoft Identity Platform like Microsoft Graph.
+
+Follow the instructions in [Register an application for Microsoft identity platform authentication](register-app.md) to get an application ID (also know as a client ID).
+
+## Creating the client application
+
+Replace `YOUR_CLIENT_ID` with the client ID from your app registration.
+
+
+## Authenticating on the CLI tool
+
+``` bash
+mgc login --client-id `YOUR_CLIENT_ID` --tenant-id `YOUR_TENANT_ID` --scopes User.ReadWrite --scopes Mail.ReadWrite
+```
+
+## Executing the application
+Navigate to your download folder and use the **mgc** command to run commands on the CLI SDK. 
+Add -h to your commands to view additional commands.
+
+
+### Authentication
+The SDK supports both delegeted and app-only authentication strategies. Run the command below to see supported authentication strategies.
+
+``` bash
+#View supported authentication strategies. Default is Device Code
+mgc login --help
+```
+
+#### **Delegated access**
+**1. DeviceCode authentication strategy**
+
+
+``` bash
+#Using the Default authentication (which is Device Code)
+mgc login
+```
+OR
+
+``` bash
+#Using the DeviceCode authentication  explicitly
+mgc login --strategy DeviceCode
+```
+
+**2.Interactive Browser authentication strategy**
+``` bash
+# Using interactive Browser authentication.
+mgc login --strategy InteractiveBrowser
+
+```
+
+#### **App-only access**
+**1. Client Certificate authentication strategy**
+``` bash
+# Using Client Certificate authentication.
+mgc login --strategy ClientCertificate
+
+```
+### Samples
+You can find additional samples here: [CLI SDK samples](https://github.com/microsoftgraph/msgraph-cli/tree/main/samples)
+
+
 > Note: This repository is for the .NET CLI. If you are looking for the Python CLI, it's been moved to the [msgraph-cli-archived](https://github.com/microsoftgraph/msgraph-cli-archived) repository