Add keystore interface previously omitted, middleware req

.gitignore

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+__pycache__
+*.pyc
+venv
+.venv

middleware_requirements.txt

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+attrs==19.3.0
+base58==2.0.1
+bitarray==1.2.2
+certifi==2020.6.20
+cffi==1.14.1
+chardet==3.0.4
+cryptography==3.0
+cytoolz==0.10.1
+eth-abi==2.1.1
+eth-account==0.5.2
+eth-hash==0.2.0
+eth-keyfile==0.5.1
+eth-keys==0.3.3
+eth-rlp==0.1.2
+eth-typing==2.2.1
+eth-utils==1.9.0
+hexbytes==0.2.1
+idna==2.10
+ipfshttpclient==0.6.0.post1
+json-rpc==1.13.0
+jsonschema==3.2.0
+lru-dict==1.1.6
+multiaddr==0.0.9
+netaddr==0.8.0
+parsimonious==0.8.1
+protobuf==3.12.4
+psycopg2==2.8.5
+pycparser==2.20
+pycryptodome==3.9.8
+pyrsistent==0.16.0
+pysha3==1.0.2
+requests==2.24.0
+rlp==1.2.0
+six==1.15.0
+toolz==0.10.0
+urllib3==1.25.10
+varint==1.0.2
+web3==5.12.0
+websockets==8.1

src/keystore/interface.py

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+class Keystore:
+
+    def get(self, address, password=None):
+        raise NotImplementedError
+
+    def new(self, password=None):
+        raise NotImplementedError
+