Update README.md (#10551)

* Update README.md

Updating README.md with the installation approach. Also, formatted text for consistency.

* Updated tensorflow/models/README.md

Added markdown code to hide details. User need to clic the triangle symbol to see the details.
This makes the page look better

* Update README.md

README.md

-![Logo](https://storage.googleapis.com/tf_model_garden/tf_model_garden_logo.png)
+<div align="center">
+  <img src="https://storage.googleapis.com/tf_model_garden/tf_model_garden_logo.png">
+</div>
+
+[![Python](https://img.shields.io/pypi/pyversions/tensorflow.svg?style=plastic)](https://badge.fury.io/py/tensorflow)
+[![PyPI](https://badge.fury.io/py/tensorflow.svg)](https://badge.fury.io/py/tensorflow)
 
 # Welcome to the Model Garden for TensorFlow
 
@@ -19,7 +24,88 @@ extent possible though not all models are suitable.
 | [community](community) | • A curated list of the GitHub repositories with machine learning models and implementations powered by TensorFlow 2 |
 | [orbit](orbit) | • A flexible and lightweight library that users can easily use or fork when writing customized training loop code in TensorFlow 2.x. It seamlessly integrates with `tf.distribute` and supports running on different device types (CPU, GPU, and TPU). |
 
-## [Announcements](https://github.com/tensorflow/models/wiki/Announcements)
+## Installation
+
+To install the current release of tensorflow-models, please follow any one of the methods described below.
+
+#### Method 1: Install the TensorFlow Model Garden pip package
+
+<details>
+
+**tf-models-official** is the stable Model Garden package.
+pip will install all models and dependencies automatically.
+
+```shell
+pip3 install tf-models-official
+```
+
+If you are using nlp packages, please also install **tensorflow-text**:
+
+```shell
+pip3 install tensorflow-text
+```
+
+Please check out our [example](https://github.com/tensorflow/text/blob/master/docs/tutorials/fine_tune_bert.ipynb)
+to learn how to use a PIP package.
+
+Note that **tf-models-official** may not include the latest changes in this
+github repo. To include latest changes, you may install **tf-models-nightly**,
+which is the nightly Model Garden package created daily automatically.
+
+```shell
+pip3 install tf-models-nightly
+```
+
+If you are using `nlp` packages, please also install tensorflow-text-nightly
+
+```shell
+pip3 install tensorflow-text-nightly
+```
+</details>
+
+
+#### Method 2: Clone the source
+
+<details>
+
+1. Clone the GitHub repository:
+
+```shell
+git clone https://github.com/tensorflow/models.git
+```
+
+2. Add the top-level ***/models*** folder to the Python path.
+
+```shell
+export PYTHONPATH=$PYTHONPATH:/path/to/models
+```
+
+If you are using a Colab notebook, please set the Python path with os.environ.
+
+```python
+import os
+os.environ['PYTHONPATH'] += ":/path/to/models"
+```
+
+3. Install other dependencies
+
+```shell
+pip3 install --user -r official/requirements.txt
+```
+
+Finally, if you are using nlp packages, please also install
+**tensorflow-text-nightly**:
+
+```shell
+pip3 install tensorflow-text-nightly
+```
+
+</details>
+
+
+## Announcements
+
+Please check [this page](https://github.com/tensorflow/models/wiki/Announcements) for recent announcements.
 
 ## Contributions