2610.1 - Adding readme

README.md

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+# checkpassword (SHA1Hash)
+
+WinForms app (C# / .NET 8, Windows only) that checks passwords against a pwned-password API using SHA1 hashes.
+
+## Requirements
+
+- Windows
+- .NET 8 SDK
+
+## Build / Run
+
+```
+dotnet run --project SHA1Hash
+```
+
+or build a single exe:
+
+```
+dotnet publish SHA1Hash -c Release
+```
+
+## Features
+
+- **Hash** — SHA1-hashes the entered string and queries `https://www.home.daprogs.net/pwn/indexapi.php`. Shows the hit count if the password is in the master list.
+- **ZeroTrust** — sends only `sha5` (first 5 hash chars) plus 3 chars from a random position, querying `https://www.home.daprogs.net/pwn/zerotrust.php`. Reveals the full hash only if the server confirms a match.
+- **Create Report** — reads `passList-tci.csv` (rows: `user;...;password;domain`), hashes each password, queries the API, and writes compromised entries to `userReport-tci.txt`. Run from the directory containing the CSV.
+
+## Note
+
+SHA1 is used only as a lookup key for the pwned-password service, not for authentication.
+
+A Python/tkinter port of this app lives in the sibling repository `checkpassword_py`.