Add PLAN.org project planning file

PLAN.org

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+#+TITLE: hnix Project Plan
+
+* Goals
+
+The purpose of hnix is provide a fully featured, compatible implementation of
+the Nix language, sufficient to evaluate and make use of the nixpkgs package
+repository definitions. The intent is to provide a convenient basis for
+creating new tooling in Haskell for the Nix ecosystem, and to provide an
+second implementation apart from the current C++ code base used by the Nix
+project.
+
+
+* What needs to be done
+
+** PROJECT Pass the Nix language tests
+:PROPERTIES:
+:ID:       BB4190F1-695D-454A-8E14-492651B4EC9F
+:CREATED:  [2018-04-23 Mon 17:12]
+:URL:      https://github.com/jwiegley/hnix/milestone/1
+:END:
+
+We currently have just two tests remaining that need to be fixed to pass the
+Nix language tests:
+
+*** TODO builtins.path:
+  https://github.com/jwiegley/hnix/issues/128
+*** TODO builtins.genericClosure:
+  https://github.com/jwiegley/hnix/issues/144
+
+** PROJECT Successfully evaluate all of nixpkgs
+:PROPERTIES:
+:ID:       E4A330E7-70C1-4E79-A94C-D63B2533EBE1
+:CREATED:  [2018-04-23 Mon 17:10]
+:URL:      https://github.com/jwiegley/hnix/milestone/2
+:END:
+
+There are still a few problems in the evaluator with process the contents of
+the nixpkgs repository:
+
+*** TODO https://github.com/jwiegley/hnix/issues/157
+*** TODO https://github.com/jwiegley/hnix/issues/193
+
+** PROJECT Increase test coverage
+:PROPERTIES:
+:ID:       5998F757-F30B-4987-89BE-4E44A1BE57BF
+:CREATED:  [2018-04-23 Mon 17:17]
+:END:
+
+*** TODO https://github.com/jwiegley/hnix/issues/158
+
+** PROJECT Improve the hnix REPL
+:PROPERTIES:
+:ID:       F824236D-7D7E-43D0-8DE6-AD66055B8935
+:CREATED:  [2018-04-23 Mon 17:17]
+:END:
+
+*** TODO https://github.com/jwiegley/hnix/issues/164
+
+** PROJECT Support concurrent evaluation
+:PROPERTIES:
+:ID:       AE9B3606-009D-43FF-A1E0-0E9A5494BFAC
+:CREATED:  [2018-04-23 Mon 17:18]
+:END:
+
+*** TODO https://github.com/jwiegley/hnix/issues/170
+
+** PROJECT Type checker
+:PROPERTIES:
+:ID:       F42B3AAB-3BA8-40DC-8B29-F534019F5832
+:CREATED:  [2018-04-23 Mon 17:16]
+:END:
+
+** PROJECT Haskell integration using a quasi-quoter
+:PROPERTIES:
+:ID:       7800EF09-5083-4819-ACD4-877B85E98C07
+:CREATED:  [2018-04-23 Mon 17:16]
+:END:
+
+
+* Colophon
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+#+ARCHIVE: PLAN-archive.txt::
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+#+TAGS: P1(1) P2(2) P3(3) Call(c) Errand(e) Home(h) Net(n) Reply(r) Waiting(w)
+#+DRAWERS: PROPERTIES LOGBOOK OUTPUT SCRIPT SOURCE DATA
+#+PROPERTY: OVERLAY (face (:background "#e8eff9"))