- readme and readme added

LICENSE.txt

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+MIT License
+
+Copyright (c) 2022-2025 András Wiesner
+
+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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+# EmbFmt
+
+A lightweight formatted printer (`printf()`) implementation for embedded systems with CMake support.
+
+## Formatting codes
+
+The library supports the following type designators:
+
+| Designator      | Type           | Description                                                  |
+| --------------- | -------------- | ------------------------------------------------------------ |
+| `%c`            | `char`         | Character                                                    |
+| `%s`            | `char *`       | Null-terminated string                                       |
+| `%d`, `%i`      | `int`          | Signed decimal integer                                       |
+| `%u`            | `unsigned int` | Unsigned decimal integer                                     |
+| `%x`, `%p`/`%X` | `unsigned int` | Unsigned hexadecimal integer with lowercase/UPPERcase digits |
+| `%f`/`%k`       | `double`       | Floating point with rounding/truncation                      |
+| `%e`            | `double`       | Floating point using scientific notation                     |
+| `%%`            | -              | '%' character                                                |
+
+## Length modifier
+
+By default, 32-bit integers are assumed (e.g.: `%u` - `uint32_t`), the `l` modifier always extends integer fields to 64 bits (e.g. `%lu` - `uint64_t`).
+
+## Precision modifier
+
+The library supports the precision modifiers, e.g. `%.4f` - four digits in the fractional part. The least significant digit is either determined by rounding (`%.3f`: 1.2345 -> 1.235), or by truncation (`%.3k`: 1.2345 -> 1.234).
+
+## Leading digits
+
+The library provides support for specifying the number and the type of leading character for numerical fields. The filling characters can be either `0` or spaces. (e.g. `%05u`: 12 -> 00012, `% 5u`: 12 -> ␣␣␣12)
+
+The length of a field can be also passed as a parameter with the `*` modifier.
+
+# License
+
+The EmbFmt library has been released under the MIT License. Developer and main contributor: [Epagris](https://github.com/epagris)