add a spec file for pyinstaller

spec/svtplay-dl.spec

@@ -0,0 +1,18 @@
+a = Analysis(['../bin/svtplay-dl'],
+             binaries=None,
+             datas=None,
+             hiddenimports=["Crypto"],
+             hookspath=None,
+             runtime_hooks=None,
+             excludes=None)
+pyz = PYZ(a.pure, a.zipped_data)
+exe = EXE(pyz,
+          a.scripts,
+          a.binaries,
+          a.zipfiles,
+          a.datas,
+          name='svtplay-dl',
+          debug=False,
+          strip=None,
+          upx=True,
+          console=True)