update readme

README.md

@@ -7,6 +7,9 @@ This project provides tools to measure the energy consumption of Flower-based fe
 - [Getting Started](#getting-started)
 - [Installation](#installation)
 - [Usage](#usage)
+  - [FL framework](#fl-framework)
+  - [Configure instances](#configure-instance)
+  - [Run exp](#run-exp)
 - [Quickstart](#quickstart)
   - [Step 1. Reserve the Hosts in G5K](#step-1-reserve-the-hosts-in-g5k)
   - [Step 2. Configure](#step-2-configure)
@@ -45,8 +48,11 @@ cd Run
 
 ## Usage
 
-- FL scripts can be updated, example in `Flower_v1`.
-- Configure instances of experiment in a json format, structure is shown below.
+### FL framework
+FL scripts (includes server and client scripts) can be updated, example in dir `Flower_v1`.
+
+### Configure instance
+Configure instances of experiment in a json format, structure is shown below.
 
   - **instances** includes **"1"**, **"2"** ,... are identifies of each instance.
   - **instance**: name of instance.
@@ -107,7 +113,8 @@ cd Run
     ```
 
 
-- 2 options of experiment: run single instance or all instances (a campaign).
+### Run exp
+2 options of experiment: run single instance or all instances (a campaign).
 
   <u>Run single instance</u>:
   ```bash