added details about submodules usage #1

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mbravorus wants to merge 1 commit from patch-2 into master

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@ -1,5 +1,22 @@
# A collection of useful scripts around Elite Dangerous #
## preparations for usage
after you have cloned this repository, you need to run
```
git submodule init
git submodule update
```
and if for some reason you get back to the existing local copy in a while, you may want to run
```
git submodule update --remote
```
to make sure the submodule(s) have been updated to the latest code
## edsm-getnearest.py ##
```