feat: added sinon for stubbing in tests. fix: added jsdoc comments to enums. feat: begin working on implementing OnspringClient methods

src/enums/TimeSpanIncrement.ts

@@ -1,9 +1,46 @@
+/**
+ * @enum TimeSpanIncrement - The increment values for a time span field.
+ */
 export enum TimeSpanIncrement {
+  /**
+   * @constant Seconds - The time span increment is seconds.
+   * @type {string}
+   */
   Seconds = 'Seconds',
+
+  /**
+   * @constant Minutes - The time span increment is minutes.
+   * @type {string}
+   */
   Minutes = 'Minutes',
+
+  /**
+   * @constant Hours - The time span increment is hours.
+   * @type {string}
+   */
   Hours = 'Hours',
+
+  /**
+   * @constant Days - The time span increment is days.
+   * @type {string}
+   */
   Days = 'Days',
+
+  /**
+   * @constant Weeks - The time span increment is weeks.
+   * @type {string}
+   */
   Weeks = 'Weeks',
+
+  /**
+   * @constant Months - The time span increment is months.
+   * @type {string}
+   */
   Months = 'Months',
+
+  /**
+   * @constant Years - The time span increment is years.
+   * @type {string}
+   */
   Years = 'Years',
 }