Add component guidelines

src/components/README.md

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+# Component Guidelines
+
+---
+
+## Directory structure
+
+For a basic component
+
+```
+├── Component
+│   ├── component.module.scss
+│   ├── Component.tsx
+│   ├── Component.types.ts
+│   ├── Component.stories.ts
+│   ├── Component.test.js
+│   └── index.ts
+```
+
+For a component suite
+
+```
+├── Component
+│   ├── BaseComponent
+│   │   ├── BaseComponent.tsx
+│   │   ├── baseComponent.module.scss
+│   │   └── BaseComponent.test.js
+│   ├── SecondaryComponent
+│   │   ├── SecondaryComponent.tsx
+│   │   ├── secondaryComponent.module.scss
+│   │   └── SecondaryComponent.test.js
+│   ├── Component.types.ts
+│   ├── Component.stories.ts
+│   └── index.ts
+```
+
+## Component definition
+
+Create a file called `/src/components/Component/Component.tsx`
+
+```tsx
+import React, { FC } from 'react';
+import { ComponentProps, ComponentType } from './Component.types';
+import { classNames } from '../../shared/utilities';
+
+import styles from 'component.module.scss';
+
+export const Component: FC<ComponentProps> = ({
+    className,
+    style,
+    // How to set defaults for props
+    type = ComponentType.base,
+    ...
+}) => {
+    // Combining class names can be done using the classNames utility
+    const componentClasses: string = classNames([
+        styles.componentWrapper,
+        className,
+        // Conditional classes can also be handled as follows
+        { [styles.active]: type === ComponentType.base }
+    ]);
+    return (
+        <div className={componentClasses} style={style}>
+            <div className={styles.componentChild}>
+                ...
+            </div>
+        </div>
+    );
+};
+```
+
+## Styling
+
+Defining a scss module
+
+-   Create a file called `/src/components/Component/component.module.scss`
+-   Use camel case for the class names, they are easier to reference in the component
+
+For eg: `styles.componentWrapper` as apposed to `styles['component-wrapper']`
+
+```scss
+.componentWrapper {
+
+  &.active {
+    ...
+  }
+
+  .componentChild {
+    ...
+  }
+}
+```
+
+## Defining types
+
+Create a file called `/src/components/Component/Component.types.ts`
+
+```ts
+import React from 'react';
+
+// Use enums of property with fixed set of values
+export enum ComponentType {
+    base = 'base',
+    secondary = 'secondary'
+}
+
+export interface ComponentProps {
+    /**
+     * Child of the component
+     */
+    children: React.ReactNode;
+    /**
+     * Custom class name
+     * @default null
+     */
+    className?: string;
+    /**
+     * Style of the component
+     * @default null
+     */
+    style?: React.CSSProperties;
+    /**
+     * Type of the component
+     * @default ComponentType.base
+     */
+    type?: ComponentType;
+    ...
+}
+```
+
+## Exporting component
+
+Create a file called `/src/components/Component/index.ts`
+
+-   Export all the components and typing created
+
+```ts
+export * from './Component.types';
+export * from './Component';
+export * from './BaseComponent/BaseComponent';
+export * from './SecondaryComponent/SecondaryComponent';
+...
+```
+
+## Storybook
+
+Create a file called `/src/components/Component/Component.stories.ts`
+
+```tsx
+import React from 'react';
+import { Component, SecondaryComponent } from './';
+
+export default {
+    title: 'Component',
+    component: Component,
+};
+
+export const Primary = () => (
+    <>
+        <p>Primary</p>
+        <Component />
+    </>
+);
+
+export const Secondary = () => (
+    <>
+        <p>Secondary</p>
+        <SecondaryComponent />
+    </>
+);
+```
+
+## Unit testing [WIP]
+
+Create a file called `/src/components/Component/Component.test.js`
+
+TBD