Update README.md

README.md

@@ -10,22 +10,22 @@ All of our models are implemented in Tensorflow>=2.0.0.
 ## 1) Table of Contents
 
 - [Athena](#athena)
-  - [Table of Contents](#table-of-contents)
-  - [Key Features](#key-features)
-  - [Installation](#installation)
-    - [1) Creating a virtual environment [Optional]](#1-creating-a-virtual-environment-optional)
-    - [2) Install *tensorflow* backend](#2-install-tensorflow-backend)
-    - [3) Install *horovod* for multiple-device training [Optional]](#3-install-horovod-for-multiple-device-training-optional)
-    - [4) Install *athena* package](#4-install-athena-package)
-    - [5) Test your installation](#5-test-your-installation)
+  - [1) Table of Contents](#table-of-contents)
+  - [2) Key Features](#key-features)
+  - [3) Installation](#installation)
+    - [3.1) Creating a virtual environment [Optional]](#1-creating-a-virtual-environment-optional)
+    - [3.2) Install *tensorflow* backend](#2-install-tensorflow-backend)
+    - [3.3) Install *horovod* for multiple-device training [Optional]](#3-install-horovod-for-multiple-device-training-optional)
+    - [3.4) Install *athena* package](#4-install-athena-package)
+    - [3.5) Test your installation](#5-test-your-installation)
     - [Notes](#notes)
-  - [Data Preparation](#data-preparation)
-    - [Create Manifest](#create-manifest)
-  - [Training](#training)
-    - [Setting the Configuration File](#setting-the-configuration-file)
-    - [Train a Model](#train-a-model)
-  - [Results](#results)
-  - [Directory Structure](#directory-structure)
+  - [4) Data Preparation](#data-preparation)
+    - [4.1) Create Manifest](#create-manifest)
+  - [5) Training](#training)
+    - [5.1) Setting the Configuration File](#setting-the-configuration-file)
+    - [5.2) Train a Model](#train-a-model)
+  - [6) Results](#results)
+  - [7) Directory Structure](#directory-structure)
 
 ## 2) Key Features