add frontend (boilerplate)

frontend/frontend.cabal

@@ -0,0 +1,31 @@
+cabal-version:   3.4
+name:            frontend
+version:         0.1.0.0
+license:         BSD-3-Clause
+license-file:    LICENSE
+maintainer:      aforemny@posteo.de
+author:          Alexander Foremny
+build-type:      Simple
+extra-doc-files: CHANGELOG.md
+
+executable frontend
+    main-is:            Main.hs
+    hs-source-dirs:     app
+    default-language:   GHC2021
+    default-extensions: CPP OverloadedStrings RecordWildCards
+    ghc-options:        -Wall
+    build-depends:
+        base,
+        bytestring,
+        containers,
+        miso,
+        text,
+        utf8-string
+
+    if !arch(javascript)
+        build-depends: jsaddle-warp
+
+    if arch(javascript)
+        build-depends: ghcjs-base
+    else
+        build-depends: http-conduit