Add initial PR for Contributing & Coding Standard (#920)

* First Design: CONTRIBUTING

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Ideas for CONTRIBUTING.md (#768)

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* Add files via upload

* fix var_tags

* add comments to AppName.sh

* Rework Contributing to merge the tow existing Versions

* Remove coding_standards.md

* Fix broken link

* Fix broken link

* UPDATE contributing

* UPDATE contributing

* UPDATE contributing

* Update

* UPDATE

* Update AppName.md

* UPDATE CONTRIBUTING.md

* UPDATE CONTRIBUTING.md

* Fixing some typos

* Update

Co-authored-by: Sébastiaan <se_bastiaan@outlook.com>

* Update Contributing

---------

Co-authored-by: Michel Roegl-Brunner <73236783+michelroegl-brunner@users.noreply.github.com>
Co-authored-by: Michel Roegl-Brunner <michel.roegl-brunner@htl-braunau.at>
Co-authored-by: Rémi Bédard-Couture <remi.bc@outlook.com>
Co-authored-by: Sébastiaan <se_bastiaan@outlook.com>

.github/CONTRIBUTOR_GUIDE/json/AppName.json

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+{
+    "name": "AppName",
+    "slug": "appname",
+    "categories": [
+        0
+    ],
+    "date_created": "DATE CREATED",
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": DEFAULT-PORT,
+    "documentation": null,
+    "website": "LINK TO WEBSITE",
+    "logo": "LINK TO LOGO",
+    "description": "Deescription of the app",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/AppName.sh",
+            "resources": {
+                "cpu": 2,
+                "ram": 2048,
+                "hdd": 4,
+                "os": "debian",
+                "version": "12"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": null,
+        "password": null
+    },
+    "notes": []
+}

.github/CONTRIBUTOR_GUIDE/json/AppName.md

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+# **AppName<span></span>.json Files**
+
+ `AppName.json` files found in the `/json` directory. These files are used to provide informations for the website. For this guide we take `/json/snipeit.json` as example.
+
+## Table of Contents
+
+- [**AppName.json Files**](#appnamejson-files)
+  - [Table of Contents](#table-of-contents)
+  - [1. JSON Generator](#1-json-generator)
+
+## 1. JSON Generator
+
+Use the [JSON Generator](https://community-scripts.github.io/ProxmoxVE/json-editor) to create this file for your application.