Update README.md

Added installation

Author: benjamin-dcs

README.md

@@ -9,5 +9,19 @@ Based on the Home Assistant Core Integrations [`File`](https://www.home-assistan
 - State of the `sensor` no longer holds the content of the file. Shows 'Ok' (for now :) ).
 - No header is written to empty/new files
 
+# Installation
+
+## 1a. Install via HACS (recommended) 
+Publish via HACS in progress..
+
+## 1b. Manual install
+1) Download the latest release of the File++ from this repository;
+2) In Home Assistant, create a folder `config/custom_components`;
+3) Add the File++ files to the `custom_components` folder (you should end up it with a `config/custom_components/file_plusplus` folder);
+4) Restart Home Assistant;
+5) Add a File++ entity as an Integration in Home Assistant `(menu: settings -> devices & services -> add integration)`;
+
+For updates, repeat step 1 to 4. Home Assistant will not delete any configuration.
+
 # Support
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