pw_env_setup: Add empty CIPD files

Add empty CIPD files for compatibility. These files will be populated in
a follow-up commit, but adding them now lets downstream projects start
to reference them before they're required.

Bug: b/254510918
Change-Id: Ib2f15b5cee57391d8ec8a883c859d3d4a8203fcf
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/115530
Reviewed-by: Alexei Frolov <frolv@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com>

Author: mohrr

pw_env_setup/py/pw_env_setup/cipd_setup/cmake.json

@@ -0,0 +1 @@
+{}

pw_env_setup/py/pw_env_setup/cipd_setup/go.json

@@ -0,0 +1 @@
+{}

pw_env_setup/py/pw_env_setup/cipd_setup/host_tools.json

@@ -0,0 +1 @@
+{}

pw_env_setup/py/pw_env_setup/cipd_setup/rbe.json

@@ -0,0 +1 @@
+{}

pw_env_setup/py/pw_env_setup/cipd_setup/upstream.json

@@ -0,0 +1 @@
+{}

pw_env_setup/py/pw_env_setup/cipd_setup/web.json

@@ -0,0 +1 @@
+{}