feat(styling): add sx method

add sx method to combine stylings

resolves #20

Signed-off-by: Niloy Sikdar <niloysikdar30@gmail.com>

src/components/Email/index.ts

@@ -1 +1 @@
-export { Email, EmailProps } from './Email';
+export * from './Email';

src/index.ts

@@ -1 +1 @@
-export { Email, EmailProps } from './components/Email';
+export * from './components/Email';

src/utils/index.ts

@@ -0,0 +1 @@
+export * from './stylings';

src/utils/stylings.ts

@@ -0,0 +1,15 @@
+import { CSSProperties } from 'react';
+
+// interface CSSClasses {
+//   [key: string]: CSSProperties;
+// }
+
+export const sx = (...args: CSSProperties[]): CSSProperties => {
+  const initialValue: CSSProperties = {};
+
+  const result = args.reduce((prev: CSSProperties, curr: CSSProperties) => {
+    return { ...prev, ...curr };
+  }, initialValue);
+
+  return result;
+};