Copy docs into Zeek repo directly

This is based on commit 99e6942efec5feff50523f6b2a1f5868f19ab638 from the
zeek-docs repo.

doc/frameworks/sqlite-read-table.zeek

@@ -0,0 +1,35 @@
+type Idx: record {
+    host: addr;
+};
+
+type Val: record {
+    users: set[string];
+};
+
+global hostslist: table[addr] of Val = table();
+
+event zeek_init()
+    {
+    Input::add_table([$source="/var/db/hosts",
+        $name="hosts",
+        $idx=Idx,
+        $val=Val,
+        $destination=hostslist,
+        $reader=Input::READER_SQLITE,
+        $config=table(["query"] = "select * from machines_to_users;")
+        ]);
+
+    Input::remove("hosts");
+    }
+
+event Input::end_of_data(name: string, source: string)
+    {
+    if ( name != "hosts" )
+        return;
+
+    # now all data is in the table
+    print "Hosts list has been successfully imported";
+
+    # List the users of one host.
+    print hostslist[192.168.17.1]$users;
+    }