improve README

README.md

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+# Raven
+
+Raven is a simple user interface library.
+
+# Dependencies
+
+ - meson *(make)*
+ - ninja *(make)* *(for meson)*
+ - cairo
+ - cairomm
+ - pango
+ - pangocairo
+ - xlib
+
+# Installing
+
+If you wish install libraven on your GNU/Linux system, run the script in `pkg/install.sh`. Before running the script, please read its contents to make sure its actions are compatible with your system setup.
+
+If you use Arch Linux or a derivative, you can use the package inside of `pkg/makepkg`:
+
+```
+$ cd pkg/makepkg
+$ makepkg -si
+```
+
+Please note that the Arch Linux package will build Raven from the remote git repository, not your local source tree.
+
+# Hacking
+
+If you wish to develop Raven or look at the test program, set up a Meson build directory and compile Raven:
+
+```
+$ meson builddir
+$ cd builddir
+$ meson compile
+```
+
+You should see `ravenapp` (the test program) and `libraven.so` (the Raven library) in the build directory.