Start 1.202610.0 development (#630)

Update README to describe the tagging procedure in detail.

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index c7711c7..2764e78 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,7 +7,9 @@
 #    https://www.khronos.org/registry/
 
 cmake_minimum_required(VERSION 3.14)
-project(SPIRV-Headers LANGUAGES C CXX VERSION 1.5.5)
+project(SPIRV-Headers
+	LANGUAGES C CXX
+	VERSION 1.202610.0)
 
 if (CMAKE_VERSION VERSION_LESS "3.21")
     # https://cmake.org/cmake/help/latest/variable/PROJECT_IS_TOP_LEVEL.html

MODULE.bazel

diff --git a/MODULE.bazel b/MODULE.bazel
index 80d5e8c..6d333a0 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -4,7 +4,7 @@
 
 module(
     name = "spirv_headers",
-    version = "1.202609.0-pre.0",
+    version = "1.202610.0",
 )
 
 bazel_dep(name = "rules_cc", version = "0.1.1")

README.md

diff --git a/README.md b/README.md
index 1ac8e8c..be4351b 100644
--- a/README.md
+++ b/README.md
@@ -235,6 +235,50 @@
   3. Other, older tagging conventions previously existed in this repo, but are
      no longer actively used.
 
+## How to cut a new release
+
+1. Tag the commit at the top of the `main` branch. Use the current version from
+   the [CMakeLists.txt](CMakeLists.txt) file.
+   Push that tag to GitHub.
+
+2. Immediately land a new commit with updated version numbers in
+   [CMakeLists.txt](CMakeLists.txt) and [MODULE.bazel](MODULE.bazel).
+
+   Use today's date to generate a CalVer version number. Use the lowest `R`
+   number to avoid collisions.
+
+### Example
+
+For example, if `CMakeLists.txt` has:
+
+       project(SPIRV-Headers
+               LANGUAGES C CXX
+               VERSION 1.202610.0)
+
+Then create the `v1.202610.0` tag:
+
+       git tag -a v1.202610.0 -m "SPIRV-Headers v1.202610.0"
+       git push origin v1.202610.0
+
+Update the version number to match the current date, and the lowest `R` that
+avoids a collision.
+
+If it's still October 2026, then bump the release number to 1:
+
+       sed -i -e s/1.202610.0/1.202610.1/ CMakeLists.txt MODULE.bazel
+
+If today is in February 2027 and this is the first release of the month, then
+use a tip version number of 0:
+
+       sed -i -e s/1.202610.0/1.202702.0/ CMakeLists.txt MODULE.bazel
+     
+Commit this change:
+
+       git add CMakeLists.txt MODULE.bazel
+       git commit -m "Start SPIRV-Headers v1.202702.0"
+
+Push this commit to main, not shown.
+
 ## License
 <a name="license"></a>
 ```