Add hie.yaml for haskell language server.

.gitignore

@@ -32,6 +32,7 @@
 !changelog.md
 !default.nix
 !pandoc.cabal
+!hie.yaml
 !release.nix
 !shell.nix
 !stack.yaml

hie.yaml

@@ -0,0 +1,25 @@
+cradle:
+  cabal:
+    - path: "./src"
+      component: "lib:pandoc"
+
+    - path: "./test"
+      component: "pandoc:test:test-pandoc"
+
+    - path: "./benchmark/benchmark-pandoc.hs"
+      component: "pandoc:bench:benchmark-pandoc"
+
+    - path: "pandoc-cli/no-server/pandoc.hs"
+      component: "pandoc-cli:exe:pandoc"
+
+    - path: "pandoc-cli/no-server/PandocCLI/Server.hs"
+      component: "pandoc-cli:exe:pandoc"
+
+    - path: "pandoc-cli/server/pandoc.hs"
+      component: "pandoc-cli:exe:pandoc"
+
+    - path: "pandoc-cli/server/PandocCLI/Server.hs"
+      component: "pandoc-cli:exe:pandoc"
+
+    - path: "pandoc-server/src"
+      component: "lib:pandoc-server"