docs/RELEASING.md: instructions for making a release

Author: mhagger

docs/RELEASING.md

@@ -0,0 +1,21 @@
+# Creating releases of `git-sizer`
+
+1.  Create a release tag and push it to GitHub:
+
+        VERSION=1.2.3
+        git tag -a v$VERSION
+        git push origin v$VERSION
+
+2.  Build the release for the major platforms:
+
+        make releases VERSION=$VERSION
+
+    The output is a bunch of ZIP files written to directory `releases/`.
+
+3.  Go to the [releases page](https://github.com/github/git-sizer/releases).
+
+4.  Click on "Draft a new release".
+
+5.  Select the tag, add the required information, and upload the zip files.
+
+6.  Click "Publish release".