Add Result.of factory method

Inspired by result4k, invokes a callback within a try/catch block,
returning an Error if an exception was thrown and Ok otherwise.

src/main/kotlin/com/github/michaelbull/result/Result.kt

@@ -7,7 +7,22 @@ package com.github.michaelbull.result
  * - Haskell: [Data.Either](https://hackage.haskell.org/package/base-4.10.0.0/docs/Data-Either.html)
  * - Rust: [Result](https://doc.rust-lang.org/std/result/enum.Result.html)
  */
-sealed class Result<out V, out E>
+sealed class Result<out V, out E> {
+    companion object {
+
+        /**
+         * Invokes a [function] and wraps it in a [Result], returning an [Error] if a [Throwable]
+         * was thrown, otherwise [Ok].
+         */
+        inline fun <T> of(function: () -> T): Result<T, Throwable> {
+            return try {
+                Ok(function.invoke())
+            } catch (t: Throwable) {
+                Error(t)
+            }
+        }
+    }
+}
 
 data class Ok<out V> constructor(val value: V) : Result<V, Nothing>()
 data class Error<out E> constructor(val error: E) : Result<Nothing, E>()