Created CONTRIBUTING.md file in utopia-php/system

[Goheljay]

Issue #2093
Assigned by @lohanidamodar
I have created a CONTRIBUTING.md file

[lohanidamodar]

appwrite/appwrite#2093

[Prakhar-Agarwal-byte]

@lohanidamodar I have been assigned this issue first. Check this appwrite/appwrite#2118 (comment)

[Prakhar-Agarwal-byte]

@lohanidamodar Can you please merge my PR (#14) as this issue was assigned to me.

[lohanidamodar]

THANK YOU! All changes merged 🥳

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