Adding 'how-to' procedure to guide users to update function blocks to…

… the latest version (#80)

README.md

@@ -78,6 +78,7 @@ is used to control access to the RS485 bus between multiple RS485 device functio
 - [Getting started guide](./docs/FAQ/Getting_started_guide_éCOCKPIT.md) (é!COCKPIT runtime)
 - [How-to: adding a new MQTT subscription](./docs/FAQ/Howto_adding_a_new_MQTT_subscription.md)
 - [How-to: verifying resource usage on a Wago PFC PLC](./docs/FAQ/Howto_verifying_resource_usage_WagoPFC.md)
+- [How-to: updating function blocks to the latest version](./docs/FAQ/Howto_updating_function_blocks.md)
 - [RS485: tips and tricks](./docs/FAQ/RS485_tips_and_tricks.md)
 - [I'm missing some functionality](./docs/FAQ/Missing_functionality.md)
 

docs/FAQ/Howto_updating_function_blocks.md

@@ -0,0 +1,18 @@
+## How-to: updating function blocks to the latest version
+This page describes the advised process to upgrade the function blocks in the project the latest version.
+
+1. Navigate to the [src/PLCOpen](https://github.com/MichielVanwelsenaere/HomeAutomation.CoDeSys3/tree/feature/docs-upgrade-functionblocks/src/PLCopen) directory on GitHub.
+2. Download the xml file. This file contains an export of the entire project. 
+3. Open your personal project, and navigate to the 'import PLCOpen' option.
+4. Select everything to import except 'HomeAutomation':
+
+<img src="../_img/FAQ_Upgrading_FunctionBlocks.png" alt="Upgrading function blocks" width="700"/>
+
+5. Resolve all conflicts by replacing:
+
+<img src="../_img/FAQ_Upgrading_FunctionBlocks_Resolve.png" alt="Upgrading function blocks conflicts" width="500"/>
+
+
+
+
+