Implement TOML parser

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docs/bun-flavored-toml.md

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+# Bun-flavored TOML
+
+[TOML](https://toml.io/) is a minimal configuration file format designed to be easy for humans to read.
+
+Bun implements a TOML parser with a few tweaks designed for better interopability with INI files and with JavaScript.
+
+### `:` == `=`
+
+Like `=`, `:` also assigns values to properties.
+
+```toml
+# In Bun-flavored TOML, these are semantically identical
+foo = '12345'
+foo : '12345'
+```
+
+### ';` == `#`
+
+In Bun-flavored TOML, comments start with `#` or `;`
+
+```ini
+# This is a comment
+; This is also a comment
+```
+
+This matches the behavior of INI files.
+
+In TOML, comments start with `#`
+
+```toml
+# This is a comment
+```
+
+### String escape characters
+
+Bun-flavored adds a few more escape sequences to TOML to work better with JavaScript strings.
+
+```
+# Bun-flavored TOML extras
+\x{XX}     - ASCII           (U+00XX)
+\u{x+}     - unicode         (U+0000000X) - (U+XXXXXXXX)
+\v         - vertical tab
+
+# Regular TOML
+\b         - backspace       (U+0008)
+\t         - tab             (U+0009)
+\n         - linefeed        (U+000A)
+\f         - form feed       (U+000C)
+\r         - carriage return (U+000D)
+\"         - quote           (U+0022)
+\\         - backslash       (U+005C)
+\uXXXX     - unicode         (U+XXXX)
+\UXXXXXXXX - unicode         (U+XXXXXXXX)
+```