begin work on #108 docs

docs/delete.md

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+# DELETE
+
+Build a _Delete_ query using the following methods. They do not need to
+be called in any particular order, and may be called multiple times.
+
+```php
+<?php
+$delete = $queryFactory->newDelete();
+
+$delete
+    ->from('foo')                   // FROM this table
+    ->where('zim = :zim')           // AND WHERE these conditions
+    ->where('gir = ?', 'doom')      // bind this value to the condition
+    ->orWhere('gir = :gir')         // OR WHERE these conditions
+    ->bindValue('bar', 'bar_val')   // bind one value to a placeholder
+    ->bindValues([                  // bind these values to the query
+        'baz' => 99,
+        'zim' => 'dib',
+        'gir' => 'doom',
+    ]);
+?>
+```
+
+Once you have built the query, pass it to the database connection of your
+choice as a string, and send the bound values along with it.
+
+```php
+<?php
+// the PDO connection
+$pdo = new PDO(...);
+
+// prepare the statement
+$sth = $pdo->prepare($delete->getStatement())
+
+// execute with bound values
+$sth->execute($delete->getBindValues());
+?>
+```