Add instructions to install LTS version

Author: natanfelles

README.md

@@ -18,10 +18,18 @@ Make sure you have [Composer](https://getcomposer.org/doc/00-intro.md) installed
 
 Follow the installation instructions in the [User Guide](https://docs.aplus-framework.com/guides/projects/app/index.html).
 
+To install the latest version:
+
 ```
 composer create-project aplus/app
 ```
 
+Or, to install the latest [LTS](https://aplus-framework.com/lts) version:
+
+```
+composer create-project aplus/app:^2
+```
+
 Enter the project directory.
 
 ## Licensing

guide/index.rst

@@ -27,6 +27,12 @@ The installation of this project can be done with Composer:
 
     composer create-project aplus/app
 
+Or, to install the latest `LTS <https://aplus-framework.com/lts>`_ version:
+
+.. code-block::
+
+    composer create-project aplus/app:^2
+
 Structure
 ---------