update description, license, and readme

Author: seyong92

pyproject.toml

@@ -1,9 +1,12 @@
 [tool.poetry]
 name = "pytsmod"
 version = "0.2.0"
-description = ""
+description = "An open-source Python library for audio time-scale modification."
 authors = ["Sangeon Yong <koragon2@kaist.ac.kr>"]
 
+license = "GPL-3.0"
+readme = "README.md"
+
 [tool.poetry.dependencies]
 python = "^3.6"
 numpy = "^1.16.0"