Added blog post

docs/en/Blog-Posts/2019-09-25 v0_21_Release/Post.md

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+# ABP v0.21 Has Been Released based on the ASP.NET Core 3.0
+
+Just one hour after Microsoft released it, ABP v0.21 [has been released](https://twitter.com/abpframework/status/1176185493119258624) based on the ASP.NET Core 3.0.
+
+v0.21 has no new feature. It just upgrades to the stable ASP.NET Core 3.0. Check [v0.20 release notes](https://github.com/abpframework/abp/releases/tag/0.20.0) for new features, enhancements and bug fixes.
+
+## About v1.0
+
+ABP framework is getting closer to v1.0. We intent to release it in the middle of this October. In this time, we will test and document more.
+
+## .NET Conf 2019
+
+Microsoft has lunched ASP.NET Core 3.0 in the .NET Conf 2019, a 3-days virtual conference. ABP's lead developer [Halil ibrahim Kalkan](https://twitter.com/hibrahimkalkan) has also talked in the conference to introduce the ABP framework. It was great to be a part of this important event.
+
+## Techorama Netherlands 2019
+
+[Techorama NL](https://techorama.nl/) is one of the biggest conferences in Europe. This year, Volosoft is a sponsor of the conference and will have a booth to talk to software developers about the ABP framework and software development. Our booth wall will look like shown below:
+
+![volosoft-booth](volosoft-booth.png)
+
+If you are in the conference, come to out booth to talk about the ABP framework. We will also have nice swags for you :)