feat: improve CLI development docs

Author: christyjacob4

templates/cli/README.md.twig

@@ -107,6 +107,50 @@ $ {{ language.params.executableName }} account get --help
 
 This library is auto-generated by {{ spec.title | caseUcfirst }} custom [SDK Generator](https://github.com/{{ spec.title | lower }}/sdk-generator). To learn more about how you can help us improve this SDK, please check the [contribution guide](https://github.com/{{ spec.title | lower }}/sdk-generator/blob/master/CONTRIBUTING.md) before sending a pull-request.
 
+To build and test the CLI for development, follow these steps 
+
+1. Clone the [SDK Generator](https://github.com/appwrite/sdk-generator)
+```sh
+$ git clone https://github.com/appwrite/sdk-generator
+```
+
+2. Ensure that docker is running locally and then run 
+```sh 
+$ cd sdk-generator
+
+# Install the composer dependencies
+$ docker run --rm --interactive --tty --volume "$(pwd)":/app composer install --ignore-platform-reqs --optimize-autoloader --no-plugins --no-scripts --prefer-dist
+
+# Generate the SDKs
+$ docker run --rm -v $(pwd):/app -w /app php:7.4-cli php example.php
+```
+
+3. Head over to the generated SDK and build the CLI docker image 
+```sh
+$ cd examples/CLI
+$ docker build -t appwrite/cli .
+```
+
+4. Install the CLI
+* MacOS and Linux
+Open `install.sh` and change [this line](https://github.com/appwrite/sdk-for-cli/blob/master/install.sh#L33) to `APPWRITE_CLI_IMAGE_VERSION=latest` and 
+comment [these lines](https://github.com/appwrite/sdk-for-cli/blob/master/install.sh#L119-L123). 
+
+You can now install the CLI using 
+```sh
+$ chmod +x install.sh
+$ ./install.sh
+```
+
+* Windows
+Open `install.ps1` and change [this line](https://github.com/appwrite/sdk-for-cli/blob/master/install.ps1#L28) to `APPWRITE_CLI_IMAGE_VERSION=latest` and 
+comment [these lines](https://github.com/appwrite/sdk-for-cli/blob/master/install.ps1#L85-L89)
+
+You can now install the CLI using 
+```sh
+$ ./install.ps1
+```
+
 ## License
 
 Please see the [{{spec.licenseName}} license]({{spec.licenseURL}}) file for more information.