chore: Add README explaining the purpose and usage of helper scripts

Signed-off-by: Michael Vetter <jubalh@iodoru.org>

scripts/README.md

@@ -0,0 +1,34 @@
+# Scripts
+
+This directory contains various scripts used for development, CI, and maintenance.
+
+## `lint-and-test.sh`
+Central validation script mainly for local development.
+
+- **Purpose:** Runs spelling checks, code formatting, and unit testing.
+- **Usage:** `./scripts/lint-and-test.sh [options]`
+- **Options:**
+  - `--fix-formatting`: Automatically apply `clang-format` fixes.
+  - `--autotools` / `--meson`: Run unit tests using the specified build system.
+  - `--hook`: Run in "hook mode" (checks only staged files).
+  - `--install`: Install the script as a git `pre-commit` hook.
+
+## `build-configuration-matrix.sh`
+Exhaustive build configuration matrix testing. It ensures that Profanity compiles and passes unit tests across a variety of feature configurations.
+
+- **Purpose:** Verifies architectural compatibility by testing many combinations of build flags.
+- **Usage:** `./scripts/build-configuration-matrix.sh`
+- **Environment:** Primarily used in CI (GitHub Actions), but can be run locally to verify all configurations.
+
+## `changelog-helper.py`
+Generates a sorted changelog from git commits since the last tag.
+
+- **Purpose:** Automates the creation of release notes by parsing Conventional Commit messages.
+- **Usage:** `python3 scripts/changelog-helper.py [--pr]`
+- **Options:** Use `--pr` to append Pull Request numbers to each entry.
+
+## `check-new-xeps.py`
+Checks for updates to XMPP Extension Protocols (XEPs).
+
+- **Purpose:** Compares the versions of XEPs implemented in Profanity (tracked in `profanity.doap`) against the latest versions available at `xmpp.org`.
+- **Usage:** `python3 scripts/check-new-xeps.py`