Change Installation section of README template to numbered list

[wooster0]

Follow-up of #6914

I didn't put a dot behind step 2 for consistency because there aren't dots either behind the steps in the Contributing section.

So now the Installation section would look like this:

---

Installation

1. Add the dependency to your shard.yml:

dependencies:
  library:
    github: user/library

2. Run shards install

[j8r]

Better to detail what "this" is:

Add the dependency to your application's shard.yml

[wooster0]

Let's exclude "application's". Because a shard.yml doesn't necessarily has to be used for just one application, it can be used for multiple applications.

So "Add the dependency to your shard.yml:"

[RX14]

In fact, most of the time you don't have to run shards init, because you've used other shards before or you've used crystal init. So I don't think we should include this advice.

[wooster0]

Most of the time, but not always. I think the section shouldn't be incomplete and describe all steps to install the shard. But I agree, most of the time shard.yml is probably there.
Maybe "Run shards init unless shard.yml already exists" or something similar?

[RX14]

I don't think we should assume that people don't know to use shards, there's obviously not enough space to explain the whole process of installing a shard.

[asterite]

Looking at one Ruby gem they say:

1. Add something to the Gemfile
2. Run bundle
3. (or install it with the gem command)

I think we just need to say:

1. Add to shards.yml
2. Execute shards

Nothing else. shards init is for initializing a project, and in fact if you use crystal init it will be there already.

[ysbaddaden]

Same.

[sdogruyol]

Thak you @r00ster91 👍

[Sija]

@sdogruyol It seems since sometime you stopped squashing commits, which leads to pretty messy commit list, is it intentional?

[sdogruyol]

@Sija nope it's not intentional. I just hate Github for changing my default merge strategy based on other repositories. I think eventually I need to write a Chrome plugin to avoid that.