Add README.md

README.md

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+# sinara-hw/datasheets
+
+Repository for Sinara hardware datasheets.
+
+## Build all
+
+```shell
+nix build .#all-pdfs
+```
+
+Output files will be in `result`.
+
+### Build individual sheets
+
+```shell
+nix develop
+make 1124
+```
+
+Output files will be in `build`. Run make twice in a row to get correct output for all LaTeX features, i.e. in particular correct "page x of y" footnotes, which require two passes of the compiler. (`#all-pdfs` already does this automatically). Auxiliary files and clutter can be removed with `make clean`.