initialize buck2 (without prelude)

.buckconfig

@@ -0,0 +1,14 @@
+[repositories]
+root = .
+prelude = prelude
+toolchains = toolchains
+none = none
+
+[repository_aliases]
+config = prelude
+fbcode = none
+fbsource = none
+buck = none
+
+[parser]
+target_platform_detector_spec = target:root//...->prelude//platforms:default

.gitignore

@@ -242,3 +242,4 @@ documentation.json
 
 /_build
 /log
+/buck-out

BUCK

@@ -0,0 +1,7 @@
+# A list of available rules and their signatures can be found here: https://buck2.build/docs/api/rules/
+
+genrule(
+    name = "hello_world",
+    out = "out.txt",
+    cmd = "echo BUILT BY BUCK2> $OUT",
+)

toolchains/BUCK

@@ -0,0 +1,6 @@
+load("@prelude//toolchains:genrule.bzl", "system_genrule_toolchain")
+
+system_genrule_toolchain(
+    name = "genrule",
+    visibility = ["PUBLIC"],
+)