Add dummy package for creating a .ghc.environment

Author: HeinrichApfelmus

docs/ghc-env/Main.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

docs/ghc-env/README.md

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+This directory contains a dummy `.cabal` file for creating a `.ghc.environment` file with a consistent set of packages.
+
+To create a `.ghc.environment` file in this directory, run
+
+```
+./mk-ghc-env.sh
+```
+
+Put your worksheet into this directory as well, and enter `.` in the "cabal — .ghc.environment" settings
+
+![](settings-back-end-cabal.png)

docs/ghc-env/cabal.project

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+packages: .
+write-ghc-environment-files: always

docs/ghc-env/ghc-env.cabal

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+cabal-version: 3.0
+name:          ghc-env
+synopsis:      Dummy .cabal file to generate a consistent set of packages.
+version:       0.1.0.0
+build-type:    Simple
+
+executable package-db-dummy
+  main-is:            Main.hs
+  build-depends:
+    , base
+    , Chart
+    , Chart-diagrams
+    , deltaq          >=1.1 && <1.2
+    , diagrams-lib
+    , diagrams-svg
+    , hyper
+    , hyper-extra
+
+  build-tool-depends: hyper-haskell-server:hyper-haskell-server
+  hs-source-dirs:     .

docs/ghc-env/mk-ghc-env.sh

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+#!/bin/sh
+cabal build && cabal install hyper-haskell-server --installdir=.