Add push/pull info in readme

[simonferquel]

- What I did

Added a bit more details in the readme about push/pull operations

- How I did it

Modified the README.md file

- How to verify it

Read it ! :)

[ijc]

Is CI stuck on this one?

[simonferquel]

Further down the current doc says:

Note: To use Application Packages as images (i.e.: save, push, or install when package is not present locally) on Windows, one must be in Linux container mode.

Is that still true for all those verbs?

Hmm, it is different now:

• if you deploy locally, you need to be in Linux Containers mode
• if you deploy remotely you need to be either in Linux Containers mode, or use lcow (and it is not tested yet)

[codecov[bot]]

Codecov Report

Merging #477 into master will increase coverage by 0.11%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #477      +/-   ##
==========================================
+ Coverage   69.41%   69.53%   +0.11%     
==========================================
  Files          50       51       +1     
  Lines        2501     2629     +128     
==========================================
+ Hits         1736     1828      +92     
- Misses        537      569      +32     
- Partials      228      232       +4

Impacted Files	Coverage Δ
internal/commands/dockerdesktop.go	46.75% <0%> (ø)
internal/store/store.go	72% <0%> (+0.57%)	:arrow_up:
types/parameters/parameters.go	96.82% <0%> (+4.76%)	:arrow_up:
internal/commands/cnab.go	79.2% <0%> (+15.15%)	:arrow_up:

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[silvin-lubecki]

@simonferquel : @dschulten has a good point here https://github.com/docker/app/issues/481#issuecomment-472999795 we should add your explanation somewhere in the README.

[chris-crone]

I've included this in #512.