Add conda build README

packaging/conda/README.md

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+# Khiops Conda Packaging Scripts
+In conda, `khiops-python` is packaged with the Khiops executables. These executables are built from
+source during the packaging process.
+
+## How to Build
+You'll need `conda-build` installed in your system. The environment variable `KHIOPS_REVISION` is
+a Git hash/branch/tag of the `khiops` repository.
+
+```bash
+# At the root of the repo
+# These commands will leave a ready to use conda channel in `./khiops-conda-build`
+KHIOPS_REVISION=10.2.0
+
+# Windows
+conda build --output-folder ./khiops-conda-build packaging/conda
+
+# Linux/macOS
+# Note: We need the conda-forge channel to obtain the pinned versions of MPICH
+conda build --channel conda-forge --output-folder ./khiops-conda-build packaging/conda
+```
+
+### Executable Signatures in macOS
+The script can sign the Khiops binaries. This is to avoid annoying firewall pop-ups. To enable this
+set the following environment variables:
+- `KHIOPS_APPLE_CERTIFICATE_ID`: The id of the signing certificate.
+- `KHIOPS_APPLE_CERTIFICATE_COMMON_NAME`: The common name of the signing certificate.
+-`KHIOPS_APPLE_CERTIFICATE_PASSWORD`: The password of the signing certificate.
+- `KHIOPS_APPLE_CERTIFICATE_BASE64`: The base64 encoding of the signing certificate.
+- `KHIOPS_APPLE_TMP_KEYCHAIN_PASSWORD` : A password for the temporary keychain created in the process.
+
+For more details see the comments in the signing section of `build.sh`.
+
+
+