Observers

chapters/introduction/lab/content/explorer/observers.md

@@ -1,4 +1,4 @@
-# Observers
+# Blockchain Observers
 
 Observers are a type of nodes that `don't participate in the consensus` but keep a peer-to-peer communication with the rest of the blockchain.
 They are usually used to see the communication between nodes (ex: debugging). 

chapters/introduction/lab/content/observer/observer.md

@@ -0,0 +1,31 @@
+# Setting up an Observer
+
+In this section we will be setting up an Observer on the [MultiversX Testnet](https://testnet-explorer.multiversx.com/).
+
+Clone the installer repository:
+
+```shell
+git clone https://github.com/multiversx/mx-chain-scripts
+```
+
+Edit `ENVIRONMENT` and `CUSTOM_HOME` in `config/variables.cfg` config file:
+
+```
+ENVIRONMENT="testnet"
+
+CUSTOM_HOME="/home/costin"
+```
+
+Please check that the `CUSTOM_HOME`` directory exists. Run the installation script as follows:
+
+```
+./script.sh observing_squad
+```
+
+Start the nodes and the Proxy using the command:
+
+```
+./script.sh start
+```
+
+If you encounter any issue please check the [MultiversX Observing Squad Documentation](https://docs.multiversx.com/integrators/observing-squad/).