Place extension documentation within the extensions folder.

diff --git a/extensions/readme.md b/extensions/readme.md
new file mode 100644 (file)
index 0000000..a039d4c
--- /dev/null
+++ b/extensions/readme.md
@@ -0,0 +1,18 @@
+# Extensions
+
+Use subfolders under the `extensions` folder to house extensions for additional variants of the final amalgamated
+hosts file.
+
+Currently this repo includes a `porn` extension which you can optionally add to your final amalgamated file.
+
+More built-in extensions are coming soon.
+
+Here's a sample call to include the `porn` extension.
+
+Using Python 3:
+
+    python3 updateHostsFile.py [--auto] --extensions porn
+
+Using Python 2.7:
+
+    python updateHostsFile.py [--auto] --extensions porn