docs(core): appending nx 19 to changelog

docs/changelog/19_0_0.md

@@ -0,0 +1,25 @@
+# Nx 19
+
+Nx 19.0 has landed, and it's ALL about reinforcing 💎Project Crystal💎!!!
+
+Catch the details in this [blog post](/blog/2024-05-07-nx-19-release) and watch the video below:
+
+{% youtube
+src="https://youtu.be/U6eO8-w9DR0"
+title="Nx 19.0 Has Landed!!"
+/%}
+
+## Features
+
+{% cards cols="2" %}
+{% card title="NEW PLUGIN: @nx/gradle" type="document" url="/blog/2024-05-07-nx-19-release#new-plugin-nxgradle" /%}
+{% card title="Nx Atomizer Enhancements" type="document" url="/blog/2024-05-07-nx-19-release#nx-atomizer-enhancements" /%}
+{% card title="More Project View Enhancements For Targets" type="document" url="/blog/2024-05-07-nx-19-release#more-project-view-enhancements-for-targets" /%}
+{% card title="Generators to Migrate to Project Crystal" type="document" url="/blog/2024-05-07-nx-19-release#generators-to-migrate-to-project-crystal" /%}
+{% card title="General Crystal Polishing" type="document" url="/blog/2024-05-07-nx-19-release#general-crystal-polishing" /%}
+{% card title="NEW CONFERENCE: Monorepo World 2024" type="document" url="/blog/2024-05-07-nx-19-release#new-conference-monorepo-world-2024" /%}
+{% /cards %}
+
+## Breaking Changes
+
+[Updating Bundled Environment Variables: `NX_` to `NX_PUBLIC_`](/blog/2024-05-07-nx-19-release#breaking-change-updating-bundled-environment-variables-to)