docs: clarify build dependencies and scripts

Author: ca-d

README.md

@@ -10,19 +10,41 @@ Open Substation Communication Designer is an editor for SCL files as described i
 
 ## Installation
 
+In order to install OpenSCD on your local device (only for you), simply visit [openscd.github.io](https://openscd.github.io), click the "Install OpenSCD" button in your address bar (Chrome or Edge on desktop) or click the "Add OpenSCD to home screen" notification in any mobile browser.
+
+In order to install your own instance of OpenSCD on your own webserver (e.g. on your company intranet), simply download [our latest release](https://github.com/openscd/open-scd/releases/latest) (`open-scd.zip` or `open-scd.tar.gz`) and extract the archive contents into the "webroot" directory of your web server.
+
+If you don't have your own webserver but still want your own version of OpenSCD hosted locally (e.g. on a system without an internet connection), you can [use a browser plugin that acts as a local webserver](https://github.com/openscd/open-scd/wiki/Install-OpenSCD#offline) (only for you) instead.
+
+## Contributing
+
+### Building
+
+If you want to build OpenSCD yourself in order to make some changes to your local installation or to contribute to the project, you may first want to install [Node.js](https://nodejs.org/) in order to be able to use our local development setup.
+
+Once Node.js is installed on your system, you may get started by entering the following lines in your command prompt:
+
 ```
 git clone https://github.com/openscd/open-scd.git
 cd open-scd
 npm install
 npm start
 ```
 
-## Scripts
+This will start a local development server and open a browser window which will automatically be reloaded as soon as you save any changes to your local source code files.
+
+If you use VSCode to develop, we recommend you install and use the [ESLint](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) and [Prettier](https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode) extensions in order to automatically lint and format your code as you edit it.
+
+### Scripts
+
+We provide the following `npm` scripts for your convenience:
 
-- `start` runs `OpenSCD` for development, reloading on file changes
-- `test` runs the test suite with Karma
-- `lint` runs the linter
-- `doc` builds markdown documentation in the `doc` directory
+- `npm start` runs `OpenSCD` for development, reloading on file changes
+- `npm test` runs the test suite with Karma
+- `npm run lint` runs the linter (fixes problems in your code)
+- `npm run format` runs the formatter (formats your code in a unified way)
+- `npm run doc` builds HTML documentation into the `doc` directory
+- `npm run build` builds a deployable version of the project into the `dist` directory
 
 ## License
 
@@ -31,6 +53,6 @@ distributed under their [end user license agreement](CC-EULA.pdf).
 
 This project is licensed under the [Apache License 2.0](LICENSE.md).
 
-© 2020-2021 OMICRON electronics GmbH
+© 2020-2022 OMICRON electronics GmbH
 
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