add Cargo metadata

Cargo.toml

@@ -2,6 +2,12 @@
 name = "planet-mars"
 version = "0.1.0"
 edition = "2021"
+authors = ["Thomas Koch <thomas@koch.ro>"]
+description = "Feed aggregation planet like Planet Venus, produces static HTML and ATOM feed from fetched feeds."
+homepage = "https://github.com/thkoch2001/planet-mars"
+license = "AGPL-3.0-or-later"
+keywords = ["atom", "rss", "planet", "feed", "blogging"]
+categories = ["web-programming"]
 
 [dependencies]
 anyhow = "*"

templates/atom.xml

@@ -4,8 +4,8 @@
   <link href="https::/planet.tvl.fyi"/>
   <updated>{{now()|date(format="%Y-%m-%dT%H:%M:%SZ")}}</updated>
   <id>https::/planet.tvl.fyi</id>
-  <generator uri="{{ PKG_HOMEPAGE }}" version="{{ PKG_VERSION }}">
-    {{ PKG_NAME }} by {{ PKG_AUTHORS }}
+  <generator uri="{{ PKG_HOMEPAGE|escape }}" version="{{ PKG_VERSION|escape }}">
+    {{ PKG_NAME|escape }} by {{ PKG_AUTHORS|escape }}
   </generator>
   <icon>https://planet.tvl.fyi/logo.svg</icon>