Merge pull request #14 from files-ui/26-add-avatar-demo-page-and-finish-avatar-component

...MainPage/SecondaryRight/ExtraComponentsMainPageAvatar.tsx

...omponents/demo-components/avatar-demo/BasicDemoAvatar.tsx

...ponents/demo-components/avatar-demo/CodeAvatarVariant.tsx

...nents/demo-components/avatar-demo/CodeDemoAvatarBasic.tsx

...ts/demo-components/avatar-demo/CodeDemoAvatarFallBack.tsx

...ents/demo-components/avatar-demo/CodeDemoAvatarLabels.tsx

...nts/demo-components/avatar-demo/CodeDemoAvatarLoading.tsx

...ts/demo-components/avatar-demo/CodeDemoAvatarPickFile.tsx

...ts/demo-components/avatar-demo/CodeDemoAvatarSmartFit.tsx

...nts/demo-components/avatar-demo/CodeDemoAvatarStyling.tsx

...onents/demo-components/avatar-demo/DemoAvatarFallBack.tsx

...mponents/demo-components/avatar-demo/DemoAvatarLabels.tsx

...ponents/demo-components/avatar-demo/DemoAvatarLoading.tsx

...onents/demo-components/avatar-demo/DemoAvatarPickFile.tsx

...ponents/demo-components/avatar-demo/DemoAvatarStyling.tsx

...ponents/demo-components/avatar-demo/DemoAvatarVarians.tsx

...ents/demo-components/avatar-demo/DmoAvatarSmartImgFit.tsx

src/data/imagesURL.js

src/files-ui/components/avatar/Avatar.tsx

src/files-ui/components/avatar/AvatarProps.ts