Add LICENSE and README.md.

Author: ThomasFrans

LICENSE

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+Copyright (c) 2023 Thomas Frans
+
+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.

README.md

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+# Cursive Flexbox
+> Sometimes you spend so much time debating whether you could, that you don't
+> stop to think whether you should...
+
+This aims to be a complete flexbox implementation for Cursive, a Rust TUI
+library. It should be complete in the sense that it supports most things that
+the CSS3 flexbox supports.
+
+> Development of this library just started so of course, it isn't complete yet.
+> Progress will be tracked below.
+
+# Currently Implemented
+- [ ] direction
+    - [x] row
+    - [ ] row-reverse
+    - [x] column
+    - [ ] column-reverse
+- [ ] justify-content
+    - [x] start
+    - [ ] end
+    - [ ] center
+    - [ ] space-between
+    - [ ] space-around
+    - [ ] space-evenly
+- [ ] align-items
+    - [x] start
+    - [ ] end
+    - [ ] center
+    - [ ] stretch
+- [ ] align-content
+    - [x] start
+    - [ ] end
+    - [ ] center
+    - [ ] stretch
+    - [ ] space-between
+    - [ ] space-around
+- [ ] gap
+    - [x] main-axis-gap
+    - [ ] cross-axis-gap
+
+# API and Guidelines
+Once more things have been implemented and I have a general overview of the
+status and implementation of the project, I'll start to work towards adhering to
+[the general Rust guidelines](https://rust-lang.github.io/api-guidelines/).
+
+# Contributions
+Contributions are very much welcome. Keep in mind that the project just started
+so there isn't much implemented yet.