Add Installation Guide for PGMQ

[Saturn225]

Closes #238
/claim #238

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[Saturn225]

@ChuckHend Done!

[ChuckHend]

@Saturn225 thank you, looks good! Should be able to merge once we get a chance to review the windows example.

[ChuckHend]

closes #316

[Saturn225]

@Saturn225 thank you, looks good! Should be able to merge once we get a chance to review the windows example.

review windows example? @ChuckHend

[ChuckHend]

Yes I'd like one of us to walk through the windows example and see how it goes before accepting. I should be able to do this in the next couple days.

[ChuckHend]

Please add missing link in the MinGW install instructions.

[Saturn225]

@theory Thanks for review! Will push the review changes requested

[Saturn225]

@ChuckHend @theory Have a another round of review on it. If any changes needed I'd like to incorporate them

[ChuckHend]

@Saturn225 , on windows, should this still be bash, and will the user have access to curl and unzip?

[ChuckHend]

If this is Powershell, lets make that clear.

[ChuckHend]

I'm a noob on Windows, and I'm getting stuck on this part 😹

[Saturn225]

@ChuckHend Yes that could make different if you go full with Windows Instructions

[Saturn225]

   Invoke-WebRequest -Uri https://api.pgxn.org/dist/pgmq/1.4.2/pgmq-1.4.2.zip -OutFile pgmq-1.4.2.zip
   Expand-Archive -Path pgmq-1.4.2.zip -DestinationPath .\pgmq-1.4.2
   cd .\pgmq-1.4.2

[Saturn225]

@ChuckHend I have updated the installation steps, have a look once

[ChuckHend]

Waiting on @theory to respond they had requested changes.