simplify examples structure (#1247)

* simplify examples structure

* update changelog

* fix imports

* rename example

* rename scripts

* changelog

pl_examples/basic_examples/README.md

@@ -1,4 +1,4 @@
-# Basic Examples   
+## Basic Examples   
 Use these examples to test how lightning works.   
 
 #### Test on CPU  
@@ -36,4 +36,27 @@ On a single node, uses all GPUs for 1 model. Then shares gradient information
 across nodes.   
 ```bash
 python gpu_template.py --gpus 2 --distributed_backend ddp2
-```
+```
+
+
+# Multi-node example   
+
+This demo launches a job using 2 GPUs on 2 different nodes (4 GPUs total).
+To run this demo do the following:
+
+1. Log into the jumphost node of your SLURM-managed cluster.  
+2. Create a conda environment with Lightning and a GPU PyTorch version.   
+3. Choose a script to submit    
+
+#### DDP  
+Submit this job to run with DistributedDataParallel (2 nodes, 2 gpus each)
+```bash
+sbatch ddp_job_submit.sh YourEnv
+```
+
+#### DDP2  
+Submit this job to run with a different implementation of DistributedDataParallel.
+In this version, each node acts like DataParallel but syncs across nodes like DDP.
+```bash
+sbatch ddp2_job_submit.sh YourEnv
+```