Rollup merge of #80280 - pierwill:x-readme, r=Mark-Simulacrum

Add installation commands to `x` tool README
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Dylan DPC 2020-12-25 03:39:38 +01:00 committed by GitHub
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# x
`x` invokes `x.py` from any subdirectory.
To install, run the following commands:
```
$ cd rust/src/tools/x/
$ cargo install --path .
```