Electron timelines (#16496)

docs/tutorial/electron-timelines.md

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+## 5.0.0 Release Schedule
+Take a look at 5.0.0 Timeline [blog post](https://electronjs.org/blog/electron-5-0-timeline) for info about publicizing our release dates.
+#### Notes:
+- These dates are our goals but there may be reasons for adjusting the stable deadline, such as security bugs.
+- These are our scheduled beta releases, however we often release more betas than scheduled.
+
+| Date/Week Of    | Release      | Comments       |
+| --------------- | ------------ | -------------- |
+| Tue, 2019-Jan-22 | 5.0.0-beta.1 |🔥 |
+| Tue, 2019-Jan-29 | 5.0.0-beta.x ||
+| Tue, 2019-Feb-05 | 5.0.0-beta.x |Last Date to Join [AFP](https://electronjs.org/blog/app-feedback-program)|
+| Tue, 2019-Feb-12 | 5.0.0-beta.x ||
+| Tue, 2019-Feb-19 | none | Maintainers Summit |
+| Tue, 2019-Feb-26 | 5.0.0-beta.x ||
+| Tue, 2019-Mar-05 | 5.0.0-beta.x | halfway mark |
+| Tue, 2019-Mar-12 | 5.0.0-beta.x ||
+| Tue, 2019-Mar-19 | 5.0.0-beta.x ||
+| Tue, 2019-Mar-26 | 5.0.0-beta.x ||
+| Tue, 2019-Apr-02 | 5.0.0-beta.x ||
+| Tue, 2019-Apr-09 | 5.0.0-beta.x ||
+| Tue, 2019-Apr-16 | none | quiet period - stable prep |
+| Tue, 2019-Apr-23 | 5.0.0 |✨stable ✨|
+Includes: Chromium M72 and Node v12.0
+
+## 6.0.0 Release Schedule
+TBD