Unit-test for Swell-v3-core

To show understanding of protocol, I will write unit-test for swETH.

I implemented the testing for:

Name		Name	Last commit message	Last commit date
Latest commit History 1 Commit
contracts		contracts
scripts		scripts
tasks		tasks
test		test
types		types
.commitlintrc.js		.commitlintrc.js
.czrc		.czrc
.editorconfig		.editorconfig
.env.example		.env.example
.eslintignore		.eslintignore
.eslintrc.yaml		.eslintrc.yaml
.gitattributes		.gitattributes
.gitignore		.gitignore
.huskyrc		.huskyrc
.prettierignore		.prettierignore
.prettierrc		.prettierrc
.solcover.js		.solcover.js
.solhint.json		.solhint.json
.solhintignore		.solhintignore
LICENSE.md		LICENSE.md
README.md		README.md
hardhat.config.ts		hardhat.config.ts
package.json		package.json
tsconfig.json		tsconfig.json
yarn.lock		yarn.lock

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