Create glacier.md

docs/glacier.md

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+Glacier is a simple package manager written in Shell.
+
+It uses wget as a backend to fetch tarballs from the package repository.
+
+It saves package information files to /etc/glacier/pkginfo
+
+### Packaging
+
+Packages should be formatted as `tar.gz` archives, and should contain the following:
+
+- The package's executable
+- 3 instruction scripts written in Shell, INSTALL.sh, UPDATE.sh, and REMOVE.sh
+- package_name-pkginfo.json, containing the following:
+```
+{
+    "package_name": "NAME HERE",
+    "package_version": "VERSION HERE",
+    "package_description": "DESCRIPTION HERE",
+    "src_tree_size": "SIZE OF SOURCE TREE HERE",
+    "exec_size": "EXECUTABLE SIZE HERE",
+    "license": "LICENSE NAME HERE",
+}
+```
+All packages should be uploaded to https://github.com/everest-linux/glacier-pkgs by adding the package tarball to the pkgs folder, and submitting a pull request.