Create a dev documentation for running a chain

[robert-zaremba]

Summary

Default procedure for running a cosmos app chain doesn't work for Umeed. We need to understand better our configuration.

Problem Definition

We apply few patches to genesis. Notably for Gravity Bridge. We need to understand what are the all components to run the single and multi node network. What are the components to run a minimum single node network (let's say without a price feeder). What are the options and how to configure them. What are the scripts and how we should use them. Moreover we need to be comfortable to make this scritps better and create tasks when something doesn't work or it's not straight forward enough.

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[facundomedica]

We have this nice thing that @RafilxTenfen wrote: https://github.com/umee-network/peggo/blob/main/test/manual-test-peggo.md we just need to add the necessary steps for price-feeder.

[khoerling]

This merged branch, plus all the latest Umeeversity should complete this issue:
umee-network/docs@8d56431

[robert-zaremba]

Reopening.
Let's link this steps in the README.md in this repository. Users won't know what they need to run. Let's just create a section "Setup" or "Start" with few links.