[Spectrum] Adds change log for Spectrum (#17717)

* Adds change log for Spectrum

* Corrects order.

Author: angelampcosta

src/content/changelogs/spectrum.yaml

@@ -0,0 +1,22 @@
+---
+link: "/spectrum/changelog/"
+productName: Spectrum
+productLink: "/spectrum/"
+productArea: Application security
+productAreaLink: /fundamentals/reference/changelog/security/
+entries:
+  - publish_date: "2023-06-27"
+    description: |-
+      - Argo Smart Routing is available for UDP applications, providing faster and more reliable traffic routing.
+  
+  - publish_date: "2019-11-07"
+    description: |-
+      - Argo Smart Routing is available for optimizing traffic on TCP applications, ensuring faster and more reliable routing.
+
+  - publish_date: "2018-10-02"
+    description: |-
+      - Users can set up Spectrum with [Cloudflare Load Balancing](/load-balancing/) to enable TCP health checks, failover support, and traffic steering, ensuring high resilience for your Spectrum applications.
+
+  
+
+  

src/content/docs/spectrum/changelog.mdx

@@ -0,0 +1,14 @@
+---
+pcx_content_type: changelog
+title: Changelog
+changelog_file_name:
+  - spectrum
+sidebar:
+  order: 11
+---
+
+import { ProductChangelog } from "~/components";
+
+{/* <!-- Actual content lives in /src/content/changelogs/spectrum.yaml. Update the file there for new entries to appear here. For more details, refer to https://developers.cloudflare.com/style-guide/documentation-content-strategy/content-types/changelog/#yaml-file --> */}
+
+<ProductChangelog />