Added recipe for boost.

recipes/boost/recipe.py

@@ -0,0 +1,12 @@
+
+import os
+from SCons.Script import *
+
+def cook(env: Environment, version: str = "1.85.0") -> dict:
+    # TODO: build binaries?
+    url = f'https://archives.boost.io/release/{version}/source/boost_{version.replace(".", "_")}.tar.gz'
+    repo = env.Cook('DownloadAndExtract', f'boost_{version}', url = url, skip_folders = 1)
+    checkout_root = repo['extracted_root']
+    return {
+        'CPPPATH': [checkout_root]
+    }