added readme

README.md

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+# python-dlinfo
+
+Python wrapper for libc's dlinfo
+
+# usage
+
+```python
+>>> from dlinfo import DLInfo
+>>> lib = ctypes.cdll.LoadLibrary(ctypes.util.find_library('c'))
+>>> dlinfo = DLInfo(lib)
+>>> dlinfo.path
+'/lib/x86_64-linux-gnu/libc.so.6'
+```