Add guidebook page for the RTG (#25040)

The Radioisotope Thermoelectric Generator (RTG) isa power source that
players may encounter in the game that doesn't have an entry in the
guidebook yet. This commit fixes that.

Resources/Locale/en-US/guidebook/guides.ftl

@@ -13,6 +13,7 @@ guide-entry-portable-generator = Portable Generators
 guide-entry-ame = Antimatter Engine (AME)
 guide-entry-singularity = Singularity
 guide-entry-teg = Thermo-electric Generator (TEG)
+guide-entry-rtg = RTG
 guide-entry-controls = Controls
 guide-entry-radio = Radio
 guide-entry-jobs = Jobs

Resources/Prototypes/Entities/Structures/Power/Generation/generators.yml

@@ -247,6 +247,10 @@
     range: 5
     sound:
       path: /Audio/Ambience/Objects/buzzing.ogg
+  - type: GuideHelp
+    guides:
+    - RTG
+    - Power
   - type: Destructible
     thresholds:
       - trigger:

Resources/Prototypes/Guidebook/engineering.yml

@@ -65,6 +65,7 @@
   - AME
   - Singularity
   - TEG
+  - RTG
 
 - type: guideEntry
   id: AME
@@ -81,6 +82,11 @@
   name: guide-entry-teg
   text: "/ServerInfo/Guidebook/Engineering/TEG.xml"
 
+- type: guideEntry
+  id: RTG
+  name: guide-entry-rtg
+  text: "/ServerInfo/Guidebook/Engineering/RTG.xml"
+
 - type: guideEntry
   id: PortableGenerator
   name: guide-entry-portable-generator

Resources/ServerInfo/Guidebook/Engineering/RTG.xml

@@ -0,0 +1,17 @@
+<Document>
+# Radioisotope Thermoelectric Generator (RTG)
+
+<Box>
+  <GuideEntityEmbed Entity="GeneratorRTG" Caption="RTG" />
+  <GuideEntityEmbed Entity="GeneratorRTGDamaged" Caption="Damaged RTG" />
+</Box>
+
+Making power using a Radioisotope Thermoelectric Generator (RTG) is similar to making power using solar.
+RTGs only provide 10 kW of power, but they provide it for free and for the entire round.
+Basically, if you connect an RTG to your power grid, it'll give you free power.
+
+Sometimes, RTGs are damaged.
+Damaged RTGs behave just like regular ones, but they're radioactive.
+That means they're more dangerous, but on the bright side, you can put radiation collectors next to them to turn that radiation into more power.
+
+</Document>