Add infrastructure and service dependencies map

docs/README.md

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+# Documentation
+
+There are 3 sets of documentation:
+
+1. Shared documentation
+2. [Claim funding for mentor training documentation](claims)
+3. [Manage school placements documentation](placements)

docs/infrastructure-map.md

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+# Infrastructure Map
+
+```mermaid
+architecture-beta
+  group app(cloud)[ITT Mentor Services]
+
+  service app_server(server)[Ruby on Rails web server] in app
+  service app_worker(server)[GoodJob worker] in app
+  service azure_frontdoor(logos:microsoft-azure)[Azure Front Door] in app
+  service db(database)[PostgreSQL] in app
+
+  service register_server(internet)[Register trainee teachers API]
+  service publish_server(internet)[Publish teacher training courses API]
+  service trs_server(internet)[Teaching record system API]
+  service gias_data(database)[Get information about schools CSV]
+
+  service browser(material-symbols:computer-outline)[Browser]
+
+  junction external
+
+  azure_frontdoor:R -- L:app_server
+
+  browser:R --> L:azure_frontdoor
+
+  app_worker:L -- R:db
+  app_server:R -- L:db
+
+  app_worker:R -- L:external
+  app_worker:T -- B:gias_data
+
+  external:R -- L:register_server
+  external:T -- B:publish_server
+  external:B -- T:trs_server
+```