[Docs] Link to colab notebooks (#1373)

* link to colab notebooks

---------

Signed-off-by: luarss <[email protected]>
Signed-off-by: Vitor Bandeira <[email protected]>
Co-authored-by: Vitor Bandeira <[email protected]>

Author: luarss

docs/toc.yml

@@ -37,5 +37,11 @@ entries:
 - file: user/FAQS.md
   title: FAQs
 
-- file: tutorials/FlowTutorial
-  title: Flow Tutorial
+
+- file: tutorials/TutorialHome
+  title: Tutorials
+  entries:
+  - file: tutorials/FlowTutorial
+    title: Flow Tutorial
+  - file: tutorials/Notebooks
+    title: Running the OpenROAD Flow in Google Colab

docs/tutorials/Notebooks.md

@@ -0,0 +1,19 @@
+# Colab Quickstart
+
+Notebook-based packaging offers three main benefits:
+1. Colab is completely free to use and can be accessed from any web browser.
+1. Colab notebooks can be easily shared with others, making it a great 
+   tool for teams to collaborate and manage OpenROAD design runs. 
+1. The notebook can easily be modified to be used for on-premise servers or 
+   notebook-based cloud providers such as LambdaLabs/Paperspace. 
+
+We provide two notebooks for a quickstart to OpenROAD-flow-scripts functionality 
+as follows:
+
+## OpenROAD-flow-scripts Automated RTL-GDSII Flow
+
+The notebook for the automated flow for `gcd` design in `nangate45` technology node can be found [here](https://colab.research.google.com/drive/1bfcvqOnbw8q7FmSONLw8q7-yBVvKsQot).
+
+## AutoTuner Flow
+
+The notebook for the OpenROAD-flow-scripts AutoTuner flow for `gcd` design in `sky130hd` technology node can be found [here](https://colab.research.google.com/drive/1wye0osn34YVWPvTrfBTftjOfGOtF3ABe).

docs/tutorials/TutorialHome.md

@@ -0,0 +1,5 @@
+# OpenROAD-flow-scripts tutorial
+
+The links to the main flow tutorial, where we go through each step of 
+the RTL-GDSII flow are as [follows](FlowTutorial.md). We have also provided
+Google Colab packaging for ease of experimentation [here](Notebooks.md).