Add documentation for creating construct libraries

[Chriscbr]

We should add a page to the website with information about how to author cdk8s construct libraries. Some of the content may overlap with the instructions for creating construct libraries for the AWS CDK, as described in the FAQ of Construct Hub: https://constructs.dev/contribute

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[felipesere]

I'd be keen to work on this as we are looking to distribute a few pre-baked charts.
At the moment, when I install our package locally into a test project I get failures due to a parent chart not being found.

For some reason, Chart.of(...) fails for

import { BasicApplication } from "shared/charts" // this is locally npm-installed

class X extends Chart {
   constructor(scope: Construct, id: string) {
     super(scope, id)
    
     new BasicApplication(this, `${id}-basic`, {
        // ... props elided....
     })
  }
}

Having spent some time in the debugger, the if (c instanceof Chart) in Chart.of(thing) fails for X, even though it extends Chart.

If I inline my entire code into e.g. vendered and change the import, all is happy...

Should I open a seprate bug for 🔼 or is that something better docs might address?

[Chriscbr]

@felipesere Yes please open a separate bug for this! Thank you :)

Edit: I went ahead and created an issue here, since I had an inkling of where a possible cause is: cdk8s-team/cdk8s-core#401

[felipesere]

I see you already have the PRs sorted 🌶️ .
Do you still need the issues?

[Chriscbr]

Nope, all good 👍

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