feat: add templates for python samples projects (#506) (#924)

These templates will be used for templates in python-docs-samples
and in Python client libraries. The README generation code is a modified
version of
https://github.com/GoogleCloudPlatform/python-docs-samples/tree/master/scripts/readme-gen.

Co-authored-by: Kurtis Van Gent <31518063+kurtisvg@users.noreply.github.com>

Source-Author: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>
Source-Date: Thu May 28 14:39:58 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: ffe10407ee2f261c799fb0d01bf32a8abc67ed1e
Source-Link: https://github.com/googleapis/synthtool/commit/ffe10407ee2f261c799fb0d01bf32a8abc67ed1e
diff --git a/synth.metadata b/synth.metadata
index f002cd6..5f24424 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-python-client.git",
-        "sha": "b8458c0b73030155b64a3c2392b2f70e5fbc3baf"
+        "sha": "510d17a52e0d500fd1a68c554a7d3dcbfdc1a5d6"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "d2364eb80b840a36136c8ce12f1c6efabcc9600e"
+        "sha": "ffe10407ee2f261c799fb0d01bf32a8abc67ed1e"
       }
     }
   ]