Create a Metrics module

fountainhead.cabal

@@ -17,7 +17,7 @@ category: Graphics
 
 extra-source-files:
   CHANGELOG.md
-  README.txt
+  README.md
 
 common dependencies
   build-depends:
@@ -25,7 +25,7 @@ common dependencies
     bytestring ^>= 0.11.0,
     text ^>= 2.0,
     zlib ^>= 0.6.3
-  default-language: Haskell2010
+  default-language: GHC2021
 
 library
   import: dependencies
@@ -33,6 +33,7 @@ library
     Graphics.Fountainhead
     Graphics.Fountainhead.Compression
     Graphics.Fountainhead.Dumper
+    Graphics.Fountainhead.Metrics
     Graphics.Fountainhead.Parser
     Graphics.Fountainhead.Type
     Graphics.Fountainhead.TrueType
@@ -62,5 +63,5 @@ executable fountainhead
     vector,
     transformers,
     time
-  hs-source-dirs: app
+  hs-source-dirs: src
   ghc-options: -Wall