Created README

README.md

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+# const_fmt
+
+An extremely lightweight library, intentionally resembling `fmtlib` as much as possible. This is achieved by moving
+as much of the formatting process as possible to compile time.
+
+Meant for systems with very few resources, such as embedded systems.
+
+## Overview
+
+During compile-time, the string to be formatted is preprocessed to the point, only the actual values to be formatted
+have to be written (If they are not available at compile time).
+
+For example `One number: {:08}; And another one: {:05.3}` is preprocessed into `One number: 000; And another one: 00.000`.
+This is returned as a `std::array<char, N>`, where `N` is automatically evaluated. The only code executed at compile
+time then formats the numbers and writes them into their place in the array.
+
+Disclaimer: The actual formatting code is largely shamelessly stolen from `fmtlib`.