test: finally add English/UTF-8 test file.

I had this test file locally for some time now, but it was always
failing, and recognized as other languages until now. Thanks to the
recent confidence improvements with new frequent/rare ratios, it is
finally detected as English by uchardet!

1 files changed, 1 insertions, 0 deletions

diff --git a/test/en/utf-8.txt b/test/en/utf-8.txt
new file mode 100644
index 0000000..f83dfe6
--- /dev/null
+++ b/test/en/utf-8.txt
@@ -0,0 +1 @@
+Europe covers about 10,180,000 km² (3,930,000 sq mi), or 2% of the Earth's surface (6.8% of land area), making it the second smallest continent (using the seven-continent model). Politically, Europe is divided into about fifty sovereign states, of which Russia is the largest and most populous, spanning 39% of the continent and comprising 15% of its population. Europe had a total population of about 746 million (about 10% of the world population) in 2018.[2][3] The European climate is largely affected by warm Atlantic currents that temper winters and summers on much of the continent, even at latitudes along which the climate in Asia and North America is severe. Further from the sea, seasonal differences are more noticeable than close to the coast.