Intro Page for Creating a Subgraph (#832)

* updating-cs-index page

* edits to spacing

Author: idalithb

nginx.conf

@@ -95,6 +95,7 @@ http {
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/deploying/deploying-a-subgraph-to-studio/$    $scheme://$http_host/docs/$1/deploying/deploy-using-subgraph-studio/        permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/deploying/subgraph-studio/$                   $scheme://$http_host/docs/$1/deploying/deploy-using-subgraph-studio/        permanent;
         rewrite ^/docs/([a-zA-Z][a-zA-Z])/managing/deprecate-a-subgraph/$               $scheme://$http_host/docs/$1/managing/delete-a-subgraph/                    permanent;
+        rewrite ^/docs/([a-zA-Z][a-zA-Z])/developing/creating-a-subgraph/$              $scheme://$http_host/docs/$1/developing/creating-a-subgraph/starting-your-subgraph/  permanent;
         # Temporary redirects (302)
         rewrite ^/docs/en/querying/graph-client/$                                       $scheme://$http_host/docs/en/querying/graph-client/README/                  redirect;
         rewrite ^/docs/en/developing/graph-ts/$                                         $scheme://$http_host/docs/en/developing/graph-ts/README/                    redirect;

website/pages/en/developing/creating-a-subgraph/_meta.js

@@ -1,4 +1,5 @@
 export default {
+  'starting-your-subgraph': '',
   'install-the-cli': '',
   'subgraph-manifest': '',
   'ql-schema': '',

website/pages/en/developing/creating-a-subgraph/starting-your-subgraph.mdx

@@ -0,0 +1,21 @@
+---
+title: Starting Your Subgraph
+---
+
+## Overview
+
+The Graph is home to thousands of subgraphs already available for query, so check [The Graph Explorer](https://thegraph.com/explorer) and find one that already matches your needs.
+
+When you create a [subgraph](/subgraphs/), you create a custom open API that extracts data from a blockchain, processes it, stores it, and makes it easy to query via GraphQL.
+
+Subgraph development ranges from simple scaffold subgraphs to advanced, specifically tailored subgraphs.
+
+### Start Building
+
+Start the process and build a subgraph that matches your needs:
+
+1. [Install the CLI](/developing/creating-a-subgraph/install-the-cli/) - Set up your infrastructure
+2. [Subgraph Manifest](/developing/creating-a-subgraph/subgraph-manifest/) - Understand a subgraph's key component
+3. [The Graph Ql Schema](/developing/creating-a-subgraph/ql-schema/) - Write your schema
+4. [Writing AssemblyScript Mappings](/developing/creating-a-subgraph/assemblyscript-mappings/) - Write your mappings
+5. [Advanced Features](/developing/creating-a-subgraph/advanced/) - Customize your subgraph with advanced features