Update README.md

Author: csabahruska

README.md

@@ -1,2 +1,66 @@
 # zip-cmd
 Simple CLI tool for the Haskell [zip](https://hackage.haskell.org/package/zip) library
+
+Run: `./zip-cmd -h`
+
+```
+zip-cmd -h
+Usage: zip-cmd [COMMAND] [-v|--version]
+
+Available options:
+  -h,--help                Show this help text
+  -v,--version             Show program version.
+
+Available commands:
+  CreateArchive            Create a new archive given its location. This will
+                           silently overwrite the specified file if it already
+                           exists.
+  WithArchive              Work with an existing archive.
+  DoesEntryExist           Check whether the specified entry exists in the
+                           archive.
+  GetEntry                 Get contents of a specific archive entry as a strict
+                           ByteString. It's not recommended to use this on big
+                           entries, because it will suck out a lot of memory.
+  SaveEntry                Save a specific archive entry as a file in the file
+                           system.
+  CheckEntry               Calculate CRC32 check sum and compare it with the
+                           value read from the archive. The function returns
+                           True when the check sums are the same—that is, the
+                           data is not corrupted.
+  UnpackInto               Unpack the archive into the specified directory. The
+                           directory will be created if it does not exist.
+  GetArchiveComment        Get the archive comment.
+  GetArchiveDescription    Get the archive description record.
+  AddEntry                 Add a new entry to the archive given its contents in
+                           binary form.
+  LoadEntry                Load an entry from a given file.
+  CopyEntry                Copy an entry “as is” from another zip archive.
+  PackDirRecur             Add an directory to the archive. Please note that due
+                           to the design of the library, empty sub-directories
+                           will not be added.
+  RenameEntry              Rename an entry in the archive. If the entry does not
+                           exist, nothing will happen.
+  DeleteEntry              Delete an entry from the archive, if it does not
+                           exist, nothing will happen.
+  Recompress               Change compression method of an entry, if it does not
+                           exist, nothing will happen.
+  SetEntryComment          Set an entry comment, if that entry does not exist,
+                           nothing will happen. Note that if binary
+                           representation of the comment is longer than 65535
+                           bytes, it will be truncated on writing.
+  DeleteEntryComment       Delete an entry's comment, if that entry does not
+                           exist, nothing will happen.
+  SetModTime               Set the last modification date/time. The specified
+                           entry may be missing, in that case the action has no
+                           effect.
+  AddExtraField            Add an extra field. The specified entry may be
+                           missing, in that case this action has no effect.
+  DeleteExtraField         Delete an extra field by its type (tag). The
+                           specified entry may be missing, in that case this
+                           action has no effect.
+  SetExternalFileAttrs     Set external file attributes. This function can be
+                           used to set file permissions.
+  SetArchiveComment        Set the comment of the entire archive.
+  DeleteArchiveComment     Delete the archive's comment if it's present.
+  RunZipCommandsFromFile   Executes zip commands from file.
+```