Add guide to enable debug logs (#32)

content/docs/guides/09_debug.md

@@ -0,0 +1,47 @@
+---
+title: How to Debug your Waku dApp
+date: 2022-01-31T00:00:00+01:00
+weight: 9
+---
+
+# How to Debug your Waku dApp
+
+JS-Waku and its most relevant dependencies (libp2p) uses [debug](https://www.npmjs.com/package/debug) to handle logs.
+
+## NodeJS
+
+To enable debug logs when running js-waku with NodeJS, simply set the `DEBUG` environment variable.
+
+To only enable js-waku debug logs:
+
+```shell
+export DEBUG=waku*
+```
+
+To enable js-waku and libp2p debug logs:
+
+```sh
+export DEBUG=waku*,libp2p*
+```
+
+To enable **all** debug logs:
+
+```sh
+export DEBUG=*
+```
+
+## Browser
+
+To see the debug logs in your browser's console, you need to modify the local storage and add `debug` key.
+
+Here are guides for some modern browsers:
+
+- [Firefox](https://developer.mozilla.org/en-US/docs/Tools/Storage_Inspector/Local_Storage_Session_Storage)
+- [Chrome](https://developer.chrome.com/docs/devtools/storage/localstorage/)
+
+
+| key     | value           | effect                               |
+|---------|-----------------|--------------------------------------|
+| `debug` | `waku*`         | enable js-waku debug logs            |  
+| `debug` | `waku*,libp2p*` | enable js-waku and libp2p debug logs |
+| `debug` | `*`             | enable **all** debug logs            |

content/docs/guides/_index.md

@@ -4,9 +4,10 @@ weight: 30
 
 # Guides
 
-## Waku Concepts
+## General Concepts
 
 - [How to Choose a Content Topic](./01_choose_content_topic/)
+- [How to Debug your Waku dApp](./09_debug/)
 
 ## JavaScript