Grammer and typos fix suggestion (#5304)

README.md

@@ -6,12 +6,12 @@
 [![Download Total Count](https://img.shields.io/github/downloads/Tencent/ncnn/total.svg?style=for-the-badge)](https://github.com/Tencent/ncnn/releases)
 [![codecov](https://img.shields.io/codecov/c/github/Tencent/ncnn/master?style=for-the-badge)](https://codecov.io/gh/Tencent/ncnn)
 
-ncnn is a high-performance neural network inference computing framework optimized for mobile platforms.
+ncnn is a high-performance neural network inference computing framework optimized for mobile platforms. 
 ncnn is deeply considerate about deployment and uses on mobile phones from the beginning of design.
-ncnn does not have third party dependencies. It is cross-platform, and runs faster than all known open source frameworks on mobile phone cpu.
-Developers can easily deploy deep learning algorithm models to the mobile platform by using efficient ncnn implementation,
-create intelligent APPs, and bring the artificial intelligence to your fingertips.
-ncnn is currently being used in many Tencent applications, such as QQ, Qzone, WeChat, Pitu and so on.
+ncnn does not have third-party dependencies.
+It is cross-platform and runs faster than all known open-source frameworks on mobile phone cpu.
+Developers can easily deploy deep learning algorithm models to the mobile platform by using efficient ncnn implementation, creating intelligent APPs, and bringing artificial intelligence to your fingertips. 
+ncnn is currently being used in many Tencent applications, such as QQ, Qzone, WeChat, Pitu, and so on.
 
 ncnn 是一个为手机端极致优化的高性能神经网络前向计算框架。
 ncnn 从设计之初深刻考虑手机端的部署和使用。