primer: add back prereq steps

Author: kay-kim

.gitignore

@@ -55,6 +55,7 @@ primer/source/tutorial/*.rst
 primer/source/includes/toc-*yaml
 primer/source/includes/steps-*yaml
 !primer/source/includes/steps-client-*.yaml
+!primer/source/includes/steps-getting-started-prereq.yaml
 primer/source/includes/release-*yaml
 primer/source/tutorial/install-mongodb-on-*.txt
 !primer/config/intersphinx.yaml

primer/source/includes/steps-getting-started-prereq.yaml

@@ -0,0 +1,64 @@
+title: Download the ``restaurants`` data.
+ref: "primer-data-download"
+edition:
+   - shell
+   - python
+   - node
+content: "Download data <link>."
+---
+title: Import data into the collection.
+ref: "primer-data-import"
+pre: |
+  In the system shell or command prompt, use ``mongoimport`` to insert
+  the documents into the ``restaurants`` collection in the ``test``
+  database. The operation will **drop** the ``restaurants`` collection
+  first, if it already exists.
+action:
+  language: javascript
+  code: |
+    mongoimport --db test --collection restaurants --drop --file "dataset.2015-01-20/dataset.json"
+edition:
+   - shell
+   - python
+---
+title: Switch to ``test`` database.
+ref: "primer-prereq-switch-db-shell"
+edition: shell
+pre: |
+   In the ``mongo`` shell connected to a running :program:`mongod`
+   instance, switch to the ``test`` database.
+action:
+   language: javascript
+   code: |
+     use test
+---
+title: Switch to ``test`` database.
+ref: "primer-prereq-switch-db-python"
+edition: python
+pre: |
+   From a Python Shell or IDLE, use
+   :py:class:`~pymongo.mongo_client.MongoClient()` to connect to the
+   running :program:`mongod` instance, and switch to the ``test``
+   database.
+action:
+  language: python
+  code: |
+    from pymongo import MongoClient
+    client = MongoClient()
+    db = client.test
+---
+title: Define required variables.
+ref: "primer-prereq-switch-db-node"
+edition: node
+pre: |
+   From a ``node`` shell, define the following variables to
+   access the required modules as well as to initialize ``url`` to the
+   :manual:`MongoDB uri </reference/connection-string>`.
+action:
+  language: javascript
+  code: |
+     var MongoClient = require('mongodb').MongoClient
+     var assert = require('assert')
+     var util = require('util').format;
+     var url = 'mongodb://localhost:27017/test';
+...