Update README.md

README.md

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 # doccano
-Active learning based document annotation tool
+
+doccano is a document annotation tool. The purpose is making annotation process efficient. First, manually labeling small data in minutes using the labeling interface. Second, train built-in classification model using the labeled data and classify unlabeled data with their probability. Then, sort data in ascending order by the probability. You can efficiently annotate the data.
+
+![doccano](docs/placeholder.png)
+
+<!--
+## Demo
+-->
+
+## Features
+
+* Active Learning based annotation
+
+## Requirements
+
+* Python3.6+
+* numpy 1.14.3+
+* scikit-learn 0.19.1+
+* scipy 1.1.0+
+
+Put data into [doccano/data](https://github.com/chakki-works/doccano/tree/master/data) directory.
+
+## Installation
+
+To install namaco, simply run:
+
+```bash
+$ git clone https://github.com/chakki-works/doccano.git
+$ cd doccano
+$ pip install -r requirements.txt
+```
+
+## Usage
+
+First, run web application:
+
+```bash
+$ cd doccano/server
+$ python run_server.py
+```
+
+Then, open <http://localhost:8080> in your browser.