docs(readme): add some unsorted tips

Author: Yurii721

README.md

@@ -18,6 +18,28 @@ Run to view commands:
 pnpm run
 ```
 
+## Some unsorted notes
+
+### Commands
+
+- `pnpm testh:vvv test/SomeContract.ts` and `pnpm testf -vvv --mc SomeContractTests` show details about events, calls, gas costs, etc.
+- `pnpm coverage:fs` show the coverage summary with branches for Foundry.
+
+### Environment variables
+
+The project can properly work without the \`.env\` file, but supports some variables (see `.env.details` for details). For example:
+
+- `BAIL=true` to stop tests on the first failure.
+- `EVM_VERSION="default"` and `HARDFORK="default"` if you would not like to use Prague, but make Hardhat behave by default.
+- `VIA_IR=false` to disable IR optimization. You may need to also disable it in `.solcover.js` if compilation issues when running coverage.
+- `COINMARKETCAP_API_KEY` and `ETHERSCAN_API_KEY` if you would like to see gas costs in dollars when running `pnpm testh:gas`.
+
+### VS Code
+
+- The `Watch` button can show/hide highlighting of the code coverage in the contract files after running `pnpm coverage`. The button is in the lower left corner of the VS Code window and added by `ryanluker.vscode-coverage-gutters`.
+
+- Open the context menu (right-click) in a contract file, after running `pnpm coverage`, and select "Coverage Gutters: Preview Coverage Report" (or press Ctrl+Shift+6) to open the coverage HTML page directly in VS Code.
+
 ## Troubleshooting
 
 Run to clean up the project: