add initial information on how to use the debbugs SQl database

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+# Bringing up SQL for Debbugs
+
+## Creation of database
+
+Debbugs needs a postgresql database (≥ 9.4) with the debversion
+extension installed. `apt-get install postgresql-9.5
+postgreql-9.5-debversion` to install those two packages.
+
+Then create a database and enable the debversion extension:
+
+    echo 'create database debbugs' | psql;
+    echo 'create extension debversion' | psql debbugs;
+    
+Debbugs also expects to be able to connect to databases using
+a
+[postgresql service definition](https://www.postgresql.org/docs/current/static/libpq-pgservice.html) which
+defines the host, port, database, and any other connection information
+which is needed. The default service is 'debbugs', but this can be
+configured using `/etc/debbugs/config` or the `--service` option to
+most commands. The most simplistic `~/.pg_service.conf` looks like this:
+
+    [debbugs]
+     host=localhost
+     database=debbugs
+
+## Insert database schema
+
+To create the database schema, run `debbugs-installsql
+--service=debbugs --install` (replacing debbugs with whatever the
+appropriate service is.) The `debbugs-installsql` command also has an
+`--upgrade` option which can be used to upgrade the schema between
+schema revisions.
+
+## Populate database initially
+
+1. Insert configuration `debbugs-loadsql configuration`
+2. Add suites `debbugs-loadsql suites --ftpdist /srv/ftp.debian.org/dists`
+3. Add packages `debbugs-loadsql packages --progress --ftpdist /srv/ftp.debian.org/dists`
+4. Add bugs `debbugs-loadsql bugs --progress --preload`
+5. Add bug logs `debbugs-loadsql logs --progress`
+6. Add maintainers `debbugs-loadsql maintainers`
+