update README.md

Author: hieunguyen1053

README.md

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+# Zalo Text-To-Speech
+
+## I. Introduction
+
+[Zalo Text-To-Speech (ZTTS)](https://zalo.ai/docs/api/text-to-audio-converter) engine delivers fast and premium quality audios from input Vietnamese text. ZTTS is optimized for realtime and high volume traffic applications such as news websites, voice streaming services, chatbots, and virtual assistants. ZTTS currently supports four Vietnamese voices including two Northern accents and two Southern accents.
+
+## II. Install ZaloTTS
+
+ZaloTTS supports python >= 3.7, <3.9
+
+Installing from PyPI is the easiest option.
+
+```bash
+$ pip install ZaloTTS
+```
+
+## III. API_KEY
+
+Get api key [here](https://zalo.ai/docs/api/getting-started).
+
+You can use the api key as an argument to initialize the ZaloTTS object.
+
+Or you can assign the environment variable ZALO_API_KEY in the `.env` file. The api key will be used when you initialize the ZaloTTS object.
+
+```plaintext
+# .env
+ZALO_API_KEY = {your_api_key}
+```
+
+## III. Speakers
+
+|ID|Name          |Constant              |
+|--|--------------|----------------------|
+|1 |South women   |ZaloTTS.SOUTH_WOMEN   |
+|2 |Northern women|ZaloTTS.NORTHERN_WOMEN|
+|3 |South men     |ZaloTTS.SOUTH_MEN     |
+|4 |Northern men  |ZaloTTS.NORTHERN_MEN  |
+
+## IV. Examples
+
+```python
+from zalo_tts import ZaloTTS
+
+tts = ZaloTTS(speaker=ZaloTTS.NORTHERN_MEN)
+tts.text_to_speech("Câu lạc bộ học thuật ICON xin chào các bạn.")
+```

demo.py

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+from zalo_tts import ZaloTTS
+
+tts = ZaloTTS(speaker=ZaloTTS.NORTHERN_MEN)
+tts.text_to_speech("Câu lạc bộ học thuật ICON xin chào các bạn.")