;doc: keep a github release template, add detailed steps for binaries

doc/github-release-template.md

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+<details>
+<summary>
+
+## Release notes (https://hledger.org/release-notes.html#hledger-A-BB)
+
+</summary>
+
+## YYYY-MM-DD hledger-A.BB
+
+**Summary.**
+<!-- ([announcement](https://groups.google.com/g/hledger/LINK)) -->
+
+### hledger A.BB
+
+<!-- etc, from release-notes.md -->
+
+</details>
+
+## Installing
+
+At <https://hledger.org/install>, binary packages should be available for this release within a few days (look for green badges). 
+
+Or, you can build from source as described there, after cloning at tag `A.BB`:
+`git clone https://github.com/simonmichael/hledger --depth 1 -b A.BB`
+
+Or, if there are release binaries below suitable for your OS and hardware, you can use those.
+<!--
+(Release binaries have been updated:
+- YYYY-MM-DD: description. [#NNNN](https://github.com/simonmichael/hledger/issues/NNNN)
+-->
+
+Here are some approximate per-platform instructions:
+
+<details>
+<summary>
+
+### GNU/Linux on 64-bit Intel
+</summary>
+At the command line,
+
+```
+$ cd /usr/local/bin
+$ curl -LOC- https://github.com/simonmichael/hledger/releases/download/A.BB/hledger-linux-x64.zip   # can rerun this if interrupted
+$ unzip -X hledger-linux-x64.zip
+$ cd -
+$ hledger --version  # should show the new version
+$ touch $HOME/.hledger.journal   # ensure a default journal file exists
+```
+</details>
+
+<details>
+<summary>
+
+### Mac on 64-bit Intel
+</summary>
+In a terminal window,
+
+```
+$ cd /usr/local/bin
+$ curl -LOC- https://github.com/simonmichael/hledger/releases/download/A.BB/hledger-mac-x64.zip
+$ unzip -X hledger-mac-x64.zip
+$ open .
+# for the hledger, hledger-ui, hledger-web icons: right-click the executable, Open, confirm it's ok to run
+$ cd -
+$ hledger --version  # should show the new version
+$ touch $HOME/.hledger.journal   # ensure a default journal file exists
+```
+</details>
+
+<details>
+<summary>
+
+### Windows 7 on 64-bit Intel, using Firefox
+</summary>
+
+- click hledger-windows-x64.zip below
+- choose Open with Windows Explorer, OK
+- click Extract all files
+- choose a destination folder - ideally one that appears in `echo %PATH%`, like `C:\Windows` (though that one will require administrator permission); otherwise, your home directory (`C:\Users\YOURNAME`)
+- check "Show extracted files when complete"
+- click Extract, wait for the destination folder to open
+- find the hledger, hledger-web icons (if you extracted to `\Windows`, you'll need to scroll down)
+- for each icon: double-click, uncheck "Always ask before opening this file", click Run
+- close those Explorer windows
+- open a command window (press Windows-r, type CMD, press enter)
+- `hledger --version` should show the new version
+- `echo # >> .hledger.journal` to ensure a default journal file exists. (Important: the doubled **>>** is needed to avoid overwriting existing data.)
+
+Problems:
+- Starting hledger by double-clicking its icon won't work because it needs arguments; run it from the command window instead.
+- Starting hledger-web by double-clicking its icon may fail because Explorer's command window is too small;
+  configure that to be larger, or run hledger-web from a command window.
+- hledger or hledger-web may fail to run if there is not enough memory available.
+</details>
+
+## Next steps
+Once installed, you could try these quick starts / tutorials:
+
+- https://hledger.org/index.html#how-to-get-started
+- https://hledger.org/add.html
+- https://hledger.org/ui.html
+- https://hledger.org/web.html
+
+
+<!--
+## Updates
+2022-06-05: linux-x64 binaries updated to run at normal speed. [#1867](https://github.com/simonmichael/hledger/issues/1867)
+2022-06-08: windows-x64 binaries fixed. [#1869](https://github.com/simonmichael/hledger/issues/1869)
+-->