Add Civ2-clone (fixes #1269)

[cxong]

No description provided.

[osgameclonesbot]

	Warnings
⚠️	🌇 Civ2-clone contains ".NET" as framework, which is not known by us. Please check for spelling errors.
⚠️	🖼 Civ2-clone has no images or videos. Please help improve the entry by finding one!

	Messages
📖	💌 Hey @axx0, we're adding your game to osgameclones!
📖	Known frameworks are .NET Core,Adobe AIR,Adventure Game Studio,Allegro,BackBone.js,Box2D,Bullet3,Construct,Construct2,Cube 2 Engine,Daemon Engine,DirectX,DIV Games Studio,Duality,Ebiten,EntityX,EnTT,Flash,GameMaker Studio,Godot,GTK+,Inform,Irrlicht,JavaFX,JMonkeyEngine,jQuery,Kylix,Laravel,LibGDX,Love3D,LÖVE,melonJS,Mono,MonoGame,ncurses,NeoAxis Engine,Netty.io,nya-engine,OGRE,Open Dynamics Engine,OpenAL,OpenGL,OpenRA,Panda3D,PandaJS,Phaser,PICO-8,pixi.js,pygame,QB64,Qt,React,Redux,rot.js,Rx.js,SDL,SDL2,Sea3D,SFML,Slick2D,Source SDK,Spring RTS Engine,Starling,SWT,three.js,TIC-80,Torque 3D,Tween.js,Unity,VDrift Engine,Vue.js,Vulkan,WebGL,wxWidgets,XNA.
📖	Game(s) added: Civ2-clone 🎊

Hey there! Thanks for contributing a PR to osgameclones! 🎉

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