My 1billion row challenge solutions in various languages

test: add test samples

Adds test samples that can be used for unit tests or to verify
implementations via:
```bash
for sample in $(ls src/test/resources/samples/*.txt)
do
echo "Validating $sample"
rm -f measurements.txt
ln -s $sample measurements.txt

diff <(./calculate_average.sh) ${sample%.txt}.out
done
rm measurements.txt
```

For #61

+1 -1
.gitignore
···
#JReleaser
out/
-
measurements*.txt
+
/measurements*.txt
+1
src/test/resources/samples/measurements-1.out
···
+
{Kunming=19.8/19.8/19.8}
+1
src/test/resources/samples/measurements-1.txt
···
+
Kunming;19.8
+1
src/test/resources/samples/measurements-10.out
···
+
{Adelaide=15.0/15.0/15.0, Cabo San Lucas=14.9/14.9/14.9, Dodoma=22.2/22.2/22.2, Halifax=12.9/12.9/12.9, Karachi=15.4/15.4/15.4, Pittsburgh=9.7/9.7/9.7, Ségou=25.7/25.7/25.7, Tauranga=38.2/38.2/38.2, Xi'an=24.2/24.2/24.2, Zagreb=12.2/12.2/12.2}
+10
src/test/resources/samples/measurements-10.txt
···
+
Halifax;12.9
+
Zagreb;12.2
+
Cabo San Lucas;14.9
+
Adelaide;15.0
+
Ségou;25.7
+
Pittsburgh;9.7
+
Karachi;15.4
+
Xi'an;24.2
+
Dodoma;22.2
+
Tauranga;38.2
+1
src/test/resources/samples/measurements-2.out
···
+
{Bosaso=19.2/19.2/19.2, Petropavlovsk-Kamchatsky=9.5/9.5/9.5}
+2
src/test/resources/samples/measurements-2.txt
···
+
Bosaso;19.2
+
Petropavlovsk-Kamchatsky;9.5