Add some more license text

LICENSE

@@ -1,15 +1,28 @@
 Sunset SSH is (c) 2022,2023 Matt Johnston and contributors
+licensed under BSD Zero Clause (0BSD) license below.
+
+--
 
 Some demo code is from Embassy project under
 MIT or Apache-2.0 license.
+Copyright (c) 2019-2022 Embassy project contributors
 
 embassy/demos/picow/src/wifi.rs
 embassy/demos/std/src/tuntap.rs
 embassy/demos/picow/src/w5500.rs
 
-picow firmware has Permissive Binary License
+--
+
+embassy/demos/picow/src/menu.rs is from "menu" crate by Jonathan Pallant
+under a MIT or Apache-2.0 license
+Copyright (c) 2018 Jonathan 'theJPster' Pallant
+
+--
+
+picow firmware has Permissive Binary License, see
 embassy/demos/picow/firmware/LICENSE-permissive-binary-license-1.0.txt
 
+---
 
 Sunset SSH is licensed under the BSD Zero Clause license:
 
@@ -24,3 +37,46 @@ LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 PERFORMANCE OF THIS SOFTWARE.
 
+---
+
+MIT licensed code:
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+---
+
+Apache-2.0 licensed code:
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.