Added a README for the packer

Signed-off-by: Valentin Popov <valentin@popov.link>

packer/README.md

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+# NRes Game Resource Packer
+
+At the moment, this is a demonstration of the NRes game resource packing algorithm in action.
+It packs 100% of the NRes game resources for the game "Parkan: Iron Strategy".
+The hash sums of the resulting files match the original game files.
+
+__Attention!__
+This is a test version of the utility. It overwrites the specified final file without asking.
+
+## Building
+
+To build the tools, you need to run the following command in the root directory:
+
+```bash
+cargo build --release
+```
+
+## Running
+
+You can run the utility with the following command:
+
+```bash
+./target/release/packer /path/to/unpack /path/to/file.ex
+```
+
+- `/path/to/unpack`: This is the directory with the resources unpacked by the [unpacker](../unpacker) utility.
+- `/path/to/file.ex`: This is the final file that will be created.