Add Finland weather CLI

.gitignore

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+__pycache__/
+*.pyc
+
 node_modules/
 .env
 npm-debug.log*

readme.txt

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+Finland Weather CLI
+====================
+
+A terminal application that prints current weather statistics for major
+cities in Finland: Helsinki, Espoo, Tampere, Vantaa, Oulu, Turku,
+Jyvaskyla, and Lahti.
+
+Weather data comes from Open-Meteo (https://open-meteo.com), a free
+service that requires no API key or signup. The script uses only the
+Python standard library, so there is nothing to install.
+
+Requirements
+------------
+- Python 3.x
+- An internet connection (to fetch live weather data)
+- No pip installation needed - the script uses only the Python standard
+  library, so there are no third-party packages to install
+
+Usage
+-----
+Run from inside the weather_app folder:
+
+    python weather.py
+
+This prints a table with current temperature, feels-like temperature,
+humidity, wind speed/direction, and conditions for all cities.
+
+To see detailed stats for a single city, pass its name as an argument
+(case-insensitive):
+
+    python weather.py tampere
+    python weather.py Helsinki
+
+If the city name is not recognized, the script prints the list of valid
+city names and exits with a non-zero status.
+
+To see a 7-day forecast instead of current conditions, add the -f (or
+--forecast) flag. It works both with a single city and with all cities:
+
+    python weather.py Helsinki --forecast
+    python weather.py -f
+
+Each forecast shows, per day: condition, high/low temperature, total
+precipitation, and max wind speed.
+
+By default, temperatures are shown in Celsius. Use -u (or --units) to
+show Fahrenheit instead. This works with any of the modes above:
+
+    python weather.py -u fahrenheit
+    python weather.py Helsinki -u fahrenheit
+    python weather.py Helsinki -f -u fahrenheit
+
+Notes
+-----
+- If a city's data cannot be fetched (e.g. no internet connection), the
+  script prints an error for that city instead of crashing.
+- Non-ASCII city names (like Jyvaskyla) are displayed correctly even on
+  Windows terminals that don't default to UTF-8.

skill.md

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+# Manual Verification Steps: weather.py
+
+Run these checks after any change to `weather.py` to confirm the CLI still
+works end to end. All commands are run from inside `weather_app/` with an
+active internet connection (the app calls the live Open-Meteo API).
+
+## 1. Default table (all cities, current conditions)
+
+```
+python weather.py
+```
+
+Expect: a table with one row per city (Helsinki, Espoo, Tampere, Vantaa,
+Oulu, Turku, Jyväskylä, Lahti) showing temp, feels-like, humidity, wind
+speed/direction, and condition. "Jyväskylä" must render correctly, not as
+mojibake (e.g. `Jyv?skyl?`).
+
+## 2. Single city, current conditions
+
+```
+python weather.py Tampere
+python weather.py tampere
+```
+
+Expect: both commands (case-insensitive) print the same detailed block
+(condition, temperature, feels like, humidity, wind, precipitation,
+observed-at timestamp) for Tampere.
+
+## 3. Unknown city
+
+```
+python weather.py NotACity
+echo $?
+```
+
+Expect: an error message listing the 8 valid city names, printed to
+stderr, and a non-zero exit code (1).
+
+## 4. 7-day forecast
+
+```
+python weather.py -f
+python weather.py Helsinki --forecast
+```
+
+Expect: `-f` alone prints a 7-day forecast block for every city in turn
+(date, condition, high/low, precipitation, max wind). `Helsinki --forecast`
+prints just Helsinki's block. Columns should stay aligned even when the
+condition text is long (e.g. "Slight rain showers").
+
+## 5. Units flag
+
+```
+python weather.py -u fahrenheit
+python weather.py Helsinki -u fahrenheit
+python weather.py Helsinki -f -u fahrenheit
+python weather.py -u kelvin
+```
+
+Expect: the first three print Fahrenheit values (suffixed `F`) in the
+table, single-city, and forecast modes respectively, with sensible values
+(e.g. ~50-60F for a Finnish autumn day, not obviously wrong). The last
+command should reject `kelvin` with an argparse usage/error message and
+exit code 2, since only `celsius` and `fahrenheit` are valid choices.
+
+## 6. Network failure handling
+
+Simulate an unreachable API by temporarily pointing the script at a bad
+host, e.g.:
+
+```
+python -c "
+import weather
+weather.API_URL = 'https://nonexistent.invalid.example/v1/forecast'
+weather.print_table(weather.CITIES)
+"
+```
+
+Expect: one error line per city (not a raw traceback), and the script
+does not crash.
+
+## 7. Readme accuracy
+
+Re-read `readme.txt` after any CLI flag change and confirm every documented
+command still matches the actual `argparse` options in `weather.py`
+(currently: optional `city` positional, `-f`/`--forecast`,
+`-u`/`--units {celsius,fahrenheit}`).