Update Pipeline Templates Readme

pipeline-templates/README.MD

@@ -1,6 +1,25 @@
 # Pipeline Templates
 
-A collection of jsonnet templates that provide specific capabilities.
+A collection of jsonnet pipeline templates that provide specific capabilities.
 
-Templates:
-* `split-combine` can be used to split text files into multiple files every x lines or combine multiple files into a single file.
+## Template Subdirectories
+
+---
+## `split-combine` 
+### Description:
+can be used to split text files into multiple files every x lines or combine multiple files into a single file.
+### Usage
+Splitting:
+This will take any files in the input repo `myrepo` and split it into seperate files every `1000` lines
+```bash
+pachctl create pipeline --jsonnet https://raw.githubusercontent.com/pachyderm/examples/master/pipeline-templates/split-combine/splitcombine.jsonnet \
+--arg name="mypipeline" --arg mode="split" \
+--arg lines=1000 --arg source="myrepo"
+```
+Combining:
+This will combine all the files in the `mypipeline_split` repo and combine them into a single file called `/pfs/out/combined.csv`
+```bash
+pachctl create pipeline --jsonnet https://raw.githubusercontent.com/pachyderm/examples/master/pipeline-templates/split-combine/splitcombine.jsonnet \
+--arg name="mypipeline_2" --arg mode="combine" --arg source="mypipeline_split" --arg output="/pfs/out/combined.csv"
+```
+---