add contributing docs

CONTRIBUTING.md

@@ -0,0 +1,60 @@
+# How To Contribute
+
+## Installation
+
+- `git clone https://github.com/jelhan/create-github-actions-setup-for-ember-addon.git`
+- `cd create-github-actions-setup-for-ember-addon`
+- `yarn install`
+
+## Architecture
+
+GitHub Actions CI workflow is created based on a template writen in [EJS](https://ejs.co/).
+It's located in `templates/.github/workflows/ci.yml`.
+
+A configuration object is used to generate a concrete workflow based on the
+template. It is defined by `ConfigurationInterface`.
+
+The data used is extracted from existing configuration files in the project.
+The utility functions responsible for parsing existing configurations are
+called parser. They are located in `src/parser/`. So far only TravisCI
+configuration (`.travis.yml`) is supported.
+
+If no configuration file supported by any available parser is found, default
+values are used.
+
+## Running latest development
+
+The project is written in TypeScript. To use latest development you must first
+compile the code to JavaScript. Run `yarn compile` to do so.
+
+Afterwards you can run latest development on any project. To do so change
+current working directory to the project and afterwards execute the script
+using a local path:
+`/path/to/create-github-actions-setup-for-ember-addon/bin/create-github-actions-setup-for-ember-addon`
+
+## Linting
+
+The project uses ESLint for linting and Prettier for code formatting. Prettier
+is integrated as an ESLint plugin.
+
+Execute `yarn lint` to run linting and `yarn lint --fix` to automatically fix
+linting issues. The latter is especially helpful to prettify the code.
+
+## Running tests
+
+The tests are executed with `yarn test`. The command also takes care of
+compiling the TypeScript to JavaScript before executing the script.
+
+The Tests are written with [jest](https://jestjs.io/).
+
+The tests use [snapshot testing](https://jestjs.io/docs/en/snapshot-testing).
+A snapshot of the created GitHub Actions CI workflow is created for each test
+scenario. It's compared against snapshots created before. The snapshots are
+checked into the repository and located at `tests/acceptance/__snapshots__`.
+
+The snaphot-based tests are expected to fail whenever the created GitHub
+Actions CI workflow changes. In many cases that changes may be expected. If so
+the snapshots must be updated. Run `yarn test -u` to do so.
+
+Please double check that all changes to snapshots are as expected by your
+change before committing the changes.

README.md

@@ -25,19 +25,10 @@ Merge requests are very much appreciated. Parts that could be improved are:
 - Only a very limited subset of common customizations of the default TravisCI configuration is supported. Would love to support more common patterns.
 - The script could be extended to allow the user to set configuration variables with command line flags rather than extracting them from an existing TravisCI configuration.
 
-### Running latest development
-
-The script is written in TypeScript. Therefore development branch can not be directly executed unless using [ts-node](https://github.com/TypeStrong/ts-node).
-
-1. Compile TypScript to Javascript: `yarn compile`
-2. Change current working directory to the root of the project you want to setup GitHub Actions on.
-3. Run the script: `/path/to/script/bin/create-github-actions-setup-for-ember-addon`
-
-### Testing
-
-Tests are written with [jest](https://jestjs.io/) using [Snapshots Testing](https://jestjs.io/docs/en/snapshot-testing). A test ist autogenerated for every file in `tests/fixtures`. Please double check that the generated snapshot is correct when adding an additional file. Snapshot tests are passing if no snapshot exists yet.
-
-The tests are executed by `yarn test`.
+Contributing documentation is provided in [CONTRIBUTING.md](CONTRIBUTING.md)
+to lower entry barrier. In case you face additional questions do not hesitate
+to either open an issue or contact me (@jelhan) on
+[Ember Community Discord](https://discord.gg/emberjs).
 
 ## License
 

src/index.ts

@@ -1,7 +1,7 @@
 import debug from './utils/debug';
 import ejs from 'ejs';
 import fs from 'fs';
-import parseTravisCiConfig from './utils/parse-travis-ci-config';
+import parseTravisCiConfig from './parser/travis-ci';
 import path from 'path';
 import process from 'process';
 

src/utils/parse-travis-ci-config.ts → src/parser/travis-ci.ts

@@ -1,5 +1,5 @@
 import { ConfigurationInterface } from '../index';
-import debug from './debug';
+import debug from '../utils/debug';
 import fs from 'fs';
 import path from 'path';
 import process from 'process';