cabal: add page

pages/common/cabal.md

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+# cabal
+
+> Command line interface to the Haskell Cabal infrastructure.
+> Manage Haskell projects and Cabal packages from Hackage et al.
+
+- Search and list packages from Hackage:
+
+`cabal list {{search_string}}`
+
+- Show information about a package:
+
+`cabal info {{package_name}}`
+
+- Download and install a package:
+
+`cabal install {{package_name}}`
+
+- Create a new Haskell project in the current directory:
+
+`cabal init`
+
+- Build the project in the current directory:
+
+`cabal build`
+
+- Run tests of the project in the current directory:
+
+`cabal test`