feat: add pandoc to required tools development doc. Closes #276 (#277)

Signed-off-by: David Seapy <[email protected]>

Author: dseapy

docs/development.md

@@ -7,7 +7,8 @@ This doc explains how to set up a development environment for Numaflow.
 1. [`go`](https://golang.org/doc/install) 1.19+
 1. [`git`](https://help.github.com/articles/set-up-git/)
 1. [`kubectl`](https://kubernetes.io/docs/tasks/tools/install-kubectl/)
-1. [`protoc`](https://github.com/protocolbuffers/protobuf) for compiling protocol buffers
+1. [`protoc`](https://github.com/protocolbuffers/protobuf) 3.19 for compiling protocol buffers
+1. [`pandoc`](https://pandoc.org/installing.html) 2.17 for generating API markdown
 1. [`Node.js®`](https://nodejs.org/en/) for running the UI
 1. [`yarn`](https://classic.yarnpkg.com/en/)
 1. [`k3d`](https://k3d.io/) for local development, if needed