CredImport finished and renamed to CredWrite

CredWrite/README.md

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+#CredWrite
+Imports given credentials to Windows Credential Manager for GEANTLink use
+
+##Usage
+```
+CredWrite <username> <password> [<realm>]
+```
+
+- `username` - a user name usually of the form user@domain
+- `password` - Base64 encoded UTF-8 user password
+- `realm`    - A realm ID to allow grouping of credentials over different WLAN profiles (optional, default is domain part of `username`)
+
+The credentials are stored to Windows Credential Manager in invoking user's roaming profile.
+
+Return codes:
+- -1 = Invalid parameters
+- 0  = Success
+- 1  = Error parsing command line
+- 2  = Error encrypting password
+- 3  = Error writing credentials to Credential Manager