add minimal NNG dummy

server/nng/.gitignore

@@ -0,0 +1 @@
+build

server/nng/NNG.lean

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+import GameServer.Commands
+
+Game "NNG"
+World "HelloWorld"
+Level 1
+
+Statement : 1 + 1 = 2 := rfl
+
+MakeGame

server/nng/lake-manifest.json

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+{"version": 4,
+ "packagesDir": "lake-packages",
+ "packages": [{"path": {"name": "GameServer", "dir": "./../leanserver"}}]}

server/nng/lakefile.lean

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+import Lake
+open Lake DSL
+
+require GameServer from ".."/"leanserver"
+
+package NNG
+
+@[default_target]
+lean_lib NNG {
+  moreLeanArgs := #["-DautoImplicit=false"]
+}

server/nng/lean-toolchain

@@ -0,0 +1 @@
+leanprover/lean4:nightly-2023-03-09