Add CI/CodeCov badges to README.md

Currently codecov is not setup to run with this repo. That will also need to be configured.

README.md

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 # Tokenized Strategy Mix for Yearn V3 strategies
 
+![CI](https://github.com/term-finance/yearn-v3-term-vault/actions/workflows/ci.yaml/badge.svg?branch=master)
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+[![codecov](https://codecov.io/gh/term-finance/yearn-v3-term-vault/graph/badge.svg?token=rSmJK0e9nG)](https://codecov.io/gh/term-finance/yearn-v3-term-vault)
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 This repo will allow you to write, test and deploy V3 "Tokenized Strategies" using [Foundry](https://book.getfoundry.sh/).
 
 You will only need to override the three functions in Strategy.sol of `_deployFunds`, `_freeFunds` and `_harvestAndReport`. With the option to also override `_tend`, `_tendTrigger`, `availableDepositLimit`, `availableWithdrawLimit` and `_emergencyWithdraw` if desired.