Add requirements

requirements.txt

+aiohttp==3.8.1
+aiosignal==1.2.0
+async-timeout==4.0.2
+attrs==21.4.0
+charset-normalizer==2.1.0
+discord.py @ git+https://github.com/Rapptz/discord.py.git@dc50736bfc3340d7b999d9f165808f8dcb8f1a60
+emoji==2.0.0
+frozenlist==1.3.0
+idna==3.3
+multidict==6.0.2
+python-dotenv==0.20.0
+yarl==1.7.2