Rough draft of instructions for adding tags/categories

[melissamcewen]

Hey it's my first time writing some documentation for Gatsby, I'd love your feedback.

[melissamcewen]

Also I learned a lot of this from https://github.com/DSchau/gatsby-blog-starter-kit though I modified it over time, so not sure where I should credit that

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[Jaikant]

A few additions.

1. In section “Creating Tag Pages”

• 

In the first code snippet at the end there is a typo it uses "Link" instead of "GatsbyLink"
• 
In the second code snippet, the import is not necessary const { createFilePath } = require(gatsby-source-filesystem)
• File gatsby-node.js, the createTagPages function will have to be called from within createPages

2. After adding fields to markdown, if we are in development mode by running ‘gatsby develop’, I had to do a restart for the new data to be available to GraphQL. [Not sure if this is always the case, but putting it out there, if it helps anyone]

[melissamcewen]

Thanks! I'll make those revisions!

[KyleAMathews]

Awesome! Thanks for tackling this @melissamcewen!

[melissamcewen]

Great, just made those corrections!

[KyleAMathews]

Thanks!

[jlengstorf]

Hiya @melissamcewen! 👋

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