diff --git a/.gitignore b/.gitignore
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
+/env
 build
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,20 @@
+alabaster==0.7.10
+Babel==2.5.3
+certifi==2018.1.18
+chardet==3.0.4
+docutils==0.14
+idna==2.6
+imagesize==1.0.0
+Jinja2==2.10
+MarkupSafe==1.0
+packaging==16.8
+Pygments==2.2.0
+pyparsing==2.2.0
+pytz==2018.3
+requests==2.18.4
+six==1.11.0
+snowballstemmer==1.2.1
+Sphinx==1.7.0
+sphinx-rtd-theme==0.2.4
+sphinxcontrib-websupport==1.0.1
+urllib3==1.22