Improve contribution guidelines (#58)

Author: krzkaczor

CONTRIBUTING.md

@@ -4,9 +4,24 @@ We welcome all contributions!
 
 ## Developing
 
-First, run `yarn` to install all deps.
+```sh
+yarn # install deps
+
+yarn build # this is required for tests to pass
+
+yarn test
+
+```
+
+Run `yarn test:fix` before pushing; it will run eslint, prettier in fix mode and run all tests.
+
+### Changesets
+
+We use [changesets](https://github.com/atlassian/changesets) for changelog management. Changeset is a file specifying
+type of change (major, minor, patch) and summary of change from the **users perspective**. Run `yarn changeset add` and
+follow the wizard.
 
-Run `yarn test:fix` before pushing, it will run eslint, prettier in fix mode and run all tests.
+As a one-time contributor, you don't need to worry about this as a maintainer will usually write a changeset for you.
 
 ### Local linking
 
@@ -16,5 +31,5 @@ Run `yarn build` to build all packages or `yarn watch` to start watching. Then e
 ### Debugging 🐞
 
 ```sh
-DEBUG=@dethcrypto/eth-sdk eth-sdk
+DEBUG=* eth-sdk
 ```

packages/eth-sdk/README.md

@@ -290,7 +290,7 @@ it's better to use TypeChain directly (especially via HardHat integration).
 
 # Contributing
 
-Check out our [contributing guidelines](./CONTRIBUTING.md)
+Check out our [contributing guidelines](./CONTRIBUTING.md).
 
 # License