docs: add a contributing.md with info on setting up the repo

CONTRIBUTING.md

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+
+
+## Setup Repo 
+
+git clone --recurse-submodules -j8 [email protected]:sablier-labs/v2-core.git
+
+### Install Dependencies
+
+npm install
+
+npx husky install 
+
+npx husky add .husky/commit-msg  'npx --no -- commitlint --edit ${1}'
+
+forge install
+
+### Pull Requests
+
+All tests must pass
+
+Commits must be linted
+
+A descriptive summary of the PR has been provided.
+
+### Environment Variables
+
+Some of the tests and features of this repository require environment variables to be set up.
+
+Copy the .env.example file to create a .env and populate it with the appropriate environment values that you have control control