Add 'init' function for setting up new projects

Author: tedivm

README.md

@@ -8,6 +8,8 @@ merge (or close) pull requests.
 The file `.gitconsensus.yaml` needs to be placed in the repository to be managed. Any rule set to `false` or ommitted
 will be skipped.
 
+You can run `gitconsensus init` to start with a template configuration in the current working directory.
+
 ```yaml
 # Which version of the consensus rules to use
 version: 3
@@ -95,6 +97,15 @@ gitconsensus auth
 You will be asked for your username, password, and 2fa token (if configured). This will be used to get an authentication
 token from Github that will be used in place of your username and password (which are never saved).
 
+### Initialization
+
+Initialize the configuration for a specific project. If no template is provided the `recommended` settings will be used.
+All settings come from the [gitconsensus_examples](https://github.com/gitconsensus/gitconsensus_examples) project.
+
+```shell
+gitconsensus init [TEMPLATE]
+```
+
 ### Merge
 
 Merge all pull requests that meet consensus rules.

gitconsensus/gitconsensus.py

@@ -2,6 +2,7 @@
 import github3
 import os
 import random
+import requests
 from gitconsensus import config
 from gitconsensus.repository import Repository
 import string
@@ -31,6 +32,28 @@ def twofacallback(*args):
         fd.write(auth.token + '\n')
 
 
+@cli.command(short_help="Create a new gitconsensus configuration")
+@click.argument('template', required=False)
+def init(template):
+    if not template:
+        template = 'recommended'
+
+    if os.path.isfile('.gitconsensus.yaml'):
+        click.echo('.gitconsensus.yaml already exists.')
+        exit(-1)
+
+    baseurl = 'https://raw.githubusercontent.com/gitconsensus/gitconsensus_examples/master/examples/%s/.gitconsensus.yaml'
+    url = baseurl % (template)
+    response = requests.get(url)
+
+    if not response.ok:
+        click.echo('Unable to find template "%s"' % (template))
+        exit(-1)
+
+    with open('.gitconsensus.yaml', 'wb') as f:
+        f.write(response.content)
+
+
 @cli.command(short_help="List open pull requests and their status")
 @click.argument('username')
 @click.argument('repository_name')