Add sc-im sheet

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+# The TUI Spreadsheet
+
+Resources:
+
+* <https://github.com/groessler/scim/blob/master/src/doc>
+* <https://github.com/jonnieey/Sc-im-Tutorial>
+
+## Basic editing
+
+* `<`/`\`/`>`: insert left/center/right-aligned string
+* `=`: insert numeric expression
+* `e`: edit numeric
+    * If accidentally added to text field, can erase with `=<RET>` (inserting an
+      empty numeric value)
+* `E`: edit string
+* `ir`/`c`: insert row/column above/to the left
+* `or`/`c`: insert row/column below/to the right
+
+## Copying
+
+* `mc`: (where `c` is a lowercase character) marks cell or range with `c`
+* `cc`: (where the second `c` is a previous mark) copies content from mark into
+  current cell, preserving formatting and adjusting formula.
+* `yy`: copy current cell/selection
+* `Pv`: paste only the value
+* `Pf`: paste only the formatting
+* `yr`/`c`: yank row/column
+* `p`: paste below/on the left
+* `t`: paste above/on the right
+
+## Movement
+
+* `hjkl`
+* `^`/`#`: move to top/bottom of column (bottom is the last filled cell)
+* `0`/`$`: move to left/right of row (rightmost is the last filled cell)
+* `goc3`: go to cell C3
+* `g0`/`$`: move to left/rightmost visible column
+* `c-e`/`y`: scroll down/up maintaining cursor position
+* `zh`/`l`: scroll left/right maintaining cursor position
+* `c-f`/`b`: scroll page down/up
+
+## Hiding/unhiding
+
+"Z" for "zap" when hiding.
+
+* `Z[cr]`: zap current column/row.
+* `S[cr]`: shows hidden columns/rows in selected range (select with c-v)
+
+## Formatting
+
+* `c-j`: auto-fit column width
+* `{`/`|`/`}`: align text left/center/right
+* `f-`/`+`: decrease/increase decimal precision
+* `f<`/`>`: decrease/increase column width
+
+### Scientific notation
+
+    :format "#.##e-#"
+
+The two `#`s after the decimal point give precision. `e-` means scientific
+notation, with sign only if the exponent is negative.