Added a README.

README.md

@@ -0,0 +1,40 @@
+# libfontcharacter - Library for manipulating CASIO's character encoding
+## Introduction
+This library is there to manipulate CASIO's character encoding, which is
+used on its calculators. It's called `FONTCHARACTER` as it's the name of
+the "type" (actually, it's a define) of the characters in its SDK.
+
+## Prerequisites
+Side note: the library might work with older versions of these dependencies,
+I took these as a reference because these are the ones I work with.
+
+### Making-only dependencies
+| Name                                               | Version  |
+| -------------------------------------------------- | -------- |
+| [make](https://www.gnu.org/software/make/)         | >= 4.0   |
+| [gcc](https://gcc.gnu.org/)                        | >= 4.9   |
+| [binutils](https://www.gnu.org/software/binutils/) | >= 2.25  |
+| [asciidoc](http://asciidoc.org/)                   | >= 8.6.9 |
+| [gzip](https://www.gnu.org/software/gzip/)         | >= 1.6   |
+| [python3](https://www.python.org/)                 | >= 3.5   |
+
+## Building
+Just `./configure` then `make`.
+To install, use `make install`.
+
+If you're using a custom target, by default, the prefix will be
+`/usr/<target>`; to change this, use file options using the
+configure script options (see `./configure --help`).
+To build a DLL for MS-Windows, use a XXX-wXX-mingwXX target.
+
+To build and install only the lib, use `all-lib` then `install-lib`.
+To build and install only the docs, use `all-doc` and `install-doc`.
+
+Other useful targets:
+
+- `uninstall`, `uninstall-lib`, `uninstall-bin`, `uninstall-doc`:
+  will try to uninstall using the current configuration (experimental);
+- `mostlyclean`, `clean`, `clean-doc`, `mostlyclean-lib`, `clean-lib`:
+  remove built files at different levels;
+- `re`, `re-lib`, `re-doc`: regenerate built files at different levels
+  (clean and build) -- useful when configuration is changed.