Create determine_trend.py

Signed-off-by: Ruslan Senatorov <55090151+ruslansenatorov@users.noreply.github.com>

Author: ruslansenatorov

task/8_1/determine_trend.py

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+# FULL PYTHON SOLUTION
+f1, f2 = map(float, input().split())
+trend = 'inc' if f1 > 0 else ('dec' if f1 < 0 else 'flat')
+shape = 'convex' if f2 > 0 else ('concave' if f2 < 0 else 'linear')
+print(trend + ' ' + shape)