Add Readme and char/u8 const fn

README.md

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+# caniuse.rs
+
+A website to know which feature you can or cannot use in Rust.
+
+## Quickstart
+
+Head over [caniuse.rs](https://caniuse.rs/) and search for the Rust feature you are interested in.
+
+## Developpement
+
+The project uses a standard Rust toolchain.
+
+### Pre-requisites
+
+- **Cargo**
+- **wasm-pack**: `cargo install wasm-pack`
+- **Python3**
+- **rollup**: `npm i -g rollup`
+
+### Commands
+
+Once the requirements are filled up you can run the project with `./x.py serve`
+
+### Creates a new feature
+
+You may want to look at issue [#16](https://github.com/jplatte/caniuse.rs/issues/16) for missing features.
+
+When adding a new feature check on `FeatureData` in `build.rs` file for every available options

data/1.52/const_char_eq_ignore_ascii_case.md

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+title = "`char::eq_ignore_ascii_case` as `const fn`"
+impl_pr_id = 82078
+flag = "const_ascii_methods_on_intrinsics"
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data/1.52/const_char_len_utf16.md

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+title = "`char::len_utf16` as `const fn`"
+impl_pr_id = 82078
+flag = "const_char_len_utf"
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data/1.52/const_char_len_utf8.md

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+title = "`char::len_utf8` as `const fn`"
+impl_pr_id = 82078
+flag = "const_char_len_utf"
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data/1.52/const_char_to_ascii_lowercase.md

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+title = "`char::to_ascii_lowercase` as `const fn`"
+impl_pr_id = 82078
+flag = "const_ascii_methods_on_intrinsics"
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data/1.52/const_char_to_ascii_uppercase.md

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+title = "`char::to_ascii_uppercase` as `const fn`"
+impl_pr_id = 82078
+flag = "const_ascii_methods_on_intrinsics"
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data/1.52/const_u8_eq_ignore_ascii_case.md

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+title = "`u8::eq_ignore_ascii_case` as `const fn`"
+impl_pr_id = 82078
+flag = "const_ascii_methods_on_intrinsics"
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data/1.52/const_u8_to_ascii_lowercase.md

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+title = "`u8::to_ascii_lowercase` as `const fn`"
+impl_pr_id = 82078
+flag = "const_ascii_methods_on_intrinsics"
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data/1.52/const_u8_to_ascii_uppercase.md

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+title = "`u8::to_ascii_uppercase` as `const fn`"
+impl_pr_id = 82078
+flag = "const_ascii_methods_on_intrinsics"
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