Move the code over from private repository (#3)

alembic/README.md

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+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+**Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*
+
+- [Creating a new revision](#creating-a-new-revision)
+- [Running migrations](#running-migrations)
+- [Downgrading migrations](#downgrading-migrations)
+- [Check your current alembic setup](#check-your-current-alembic-setup)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+# Creating a new revision
+```
+alembic revision --autogenerate -m "enter description here"
+```
+**Note:** Please read [What does Autogenerate Detect (and what does it not detect?)](https://alembic.sqlalchemy.org/en/latest/autogenerate.html#what-does-autogenerate-detect-and-what-does-it-not-detect) and always make sure to review the generated revision file before running it.
+
+# Running migrations
+```
+alembic upgrade head
+```
+# Downgrading migrations
+```
+alembic downgrade -1
+```
+
+# Check your current alembic setup
+```
+alembic current
+```