Merge pull request #3628 from LiskHQ/3157-update-framework-modules-re…

…adme

Update framework modules readme - Closes #3157

framework/src/modules/README.md

@@ -5,6 +5,7 @@
 - [Description](#description)
   - [Core Modules](#core-modules)
   - [Custom Modules](#custom-modules)
+- [Module Configuration](#module-configuration)
 - [Module Communication](#module-communication)
   - [InMemory Channel](#inmemory-channel)
   - [ChildProcess Channel](#childprocess-channel)
@@ -22,6 +23,7 @@ Core Modules are shipped along with the Lisk Core distribution itself. These mod
 
 - **Chain Module:** handles all events and actions, that are related to the blockchain system.
 - **HTTP API Module:** provides API endpoints, that enable users and other programs to communicate with the Lisk blockchain through the API.
+- **Network Module:** handles peer-to-peer communication of nodes in the network.
 
 ### Custom Modules
 
@@ -120,6 +122,17 @@ export default class MyModule extends BaseModule {
 };
 ```
 
+## Module Configuration
+
+Configuration options for each module are located in `framework/src/modules/<module-name>/defaults/config.js`.
+
+Each `config.js` file consists of 2 parts:
+
+1. JSON-schema specification for all available config options
+2. Default values for the available config options for this specific module.
+
+Please don't change the default values in these files directly as they will be overwritten on software updates, instead define the custom configuration options inside your blockchain application.
+
 ## Module Communication
 
 Modules communicate with each other through event-based channels.
@@ -149,8 +162,3 @@ A modules' life cycle consists of following events in the right order:
 - _module_:registeredToBus
 - _module_:loading:started
 - _module_:loading:finished
-
-**Unloading**
-
-- _module_:unloading:started
-- _module_:unloading:finished