Adding a symlink to the data path on engine generate. close #93 (#97)

Great!!! Thanks!
diff --git a/marvin_python_toolbox/management/engine.py b/marvin_python_toolbox/management/engine.py
index 9ceabef..f15dbeb 100644
--- a/marvin_python_toolbox/management/engine.py
+++ b/marvin_python_toolbox/management/engine.py
@@ -444,6 +444,7 @@
 
         _copy_processed_files(TEMPLATE_BASES[type_], dest, context)
         _rename_dirs(dest, RENAME_DIRS, context)
+        _make_data_link(dest)
 
         venv_name = None
         if not no_env:
@@ -570,6 +571,12 @@
         print('WARNING: Could not initialize repository!')
 
 
+def _make_data_link(dest):
+    data_path = os.environ['MARVIN_DATA_PATH']
+    data_link = os.path.join(dest, 'notebooks/data')
+    os.symlink(data_path, data_link)
+
+
 @cli.command('engine-httpserver', help='Marvin http api server starts')
 @click.option(
     '--action',
diff --git a/marvin_python_toolbox/management/templates/python-engine/.gitignore b/marvin_python_toolbox/management/templates/python-engine/.gitignore
index 498ed68..05dd2a2 100644
--- a/marvin_python_toolbox/management/templates/python-engine/.gitignore
+++ b/marvin_python_toolbox/management/templates/python-engine/.gitignore
@@ -13,3 +13,4 @@
 .DS_Store
 .packages
 .profiling
+notebooks/data
\ No newline at end of file
diff --git a/tests/management/test_engine.py b/tests/management/test_engine.py
index f2bbbc8..91cb8ed 100644
--- a/tests/management/test_engine.py
+++ b/tests/management/test_engine.py
@@ -26,6 +26,7 @@
 from marvin_python_toolbox.management.engine import dryrun
 from marvin_python_toolbox.management.engine import engine_httpserver
 from marvin_python_toolbox.management.engine import _create_virtual_env
+from marvin_python_toolbox.management.engine import _make_data_link
 import os
 
 
@@ -207,3 +208,10 @@
     mockx.wait.assert_called_once()
     # sys_mocked.exit.assert_called_once_with(1)
 
+
+@mock.patch('marvin_python_toolbox.management.engine.os.symlink')
+def test_make_data_link_call_symlink(mock_symlink):
+    os.environ['MARVIN_DATA_PATH'] = '/tmp/'
+    dest = '/tmp/'
+    _make_data_link(dest)
+    mock_symlink.assert_called_once_with('/tmp/', '/tmp/notebooks/data')