Change this repository from 'NoiseGate' to `Dynamic processor`

[jagger2048]

We will add some dynamic processors as below,

• [x] noise gate
• [x] peak\rms limiter
• [x] peak\rms compressor
• [x] soft clipper They have been implemented in C.

Add usage and readme:

• [x] noise gate
• [ ] limiter and compressor