sync contributing from radarr [skip ci] (#1112)

* Update contributing.md Github docs URL [skip ci]

Closes #845

(cherry picked from commit 4e81b330061a758ec8ad37dbe648694187226687)

* sync contributing from radarr [skip ci]

CONTRIBUTING.md

@@ -11,17 +11,17 @@ Setup guides, FAQ, the more information we have on the [wiki](https://wiki.serva
 - Visual Studio 2019 or higher (https://www.visualstudio.com/vs/).  The community version is free and works (https://www.visualstudio.com/downloads/).
 - HTML/Javascript editor of choice (VS Code/Sublime Text/Webstorm/Atom/etc)
 - [Git](https://git-scm.com/downloads)
-- [NodeJS](https://nodejs.org/en/download/) (Node 10.X.X or higher)
+- [NodeJS](https://nodejs.org/en/download/) (Node 12.X.X or higher)
 - [Yarn](https://yarnpkg.com/)
-- .NET Core 3.1. 
+- .NET Core 5.0. 
 
 ### Getting started ###
 
 1. Fork Readarr
-2. Clone the repository into your development machine. [*info*](https://help.github.com/articles/working-with-repositories)
+2. Clone the repository into your development machine. [*info*](https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/cloning-a-repository-from-github)
 3. Install the required Node Packages `yarn install`
 4. Start gulp to monitor your dev environment for any changes that need post processing using `yarn start` command.
-5. Build the project in Visual Studio, Setting startup project to `Readarr.Console` and framework to `netcoreapp31`
+5. Build the project in Visual Studio, Setting startup project to `Readarr.Console` and framework to `net5.0`
 6. Debug the project in Visual Studio
 7. Open http://localhost:8787