docs: add scrum report poker (#19)

Signed-off-by: Klagarge <remi@heredero.ch>

docs/poker_planning_retro.md

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+# Pokerregistry.sdi.hevs.ch/mqtt2influx:v1.1.1
+For some Users stories (issues) we did a Poker like in Scrum methodology.
+We select 4 issues that we wanted to discuss.
+
+Always, the first round was without any discussion before.
+
+We vote with cards: `XS`, `S`, `M`, `L`, `XL`, `XXL` but convert with point for put in GitLab weight, `XS`=`1`, `S`=`2`, `M`=`5`, `L`=`10`, `XL`=`20`, `XXL`=`50`
+
+## Frontend (#8)
+Implement visualisation for 100 last values and button for request new value.
+
+### First round
+**Rémi** vote `XL` because for him it's an horrible language. It's also a new framework so take more time. And it's not only about implement a graph and a button.
+
+**Sylvan** vote `L` because he think a lot of template exist and not a lot of work to do
+
+**Yann** vote `XL` because it's about doing again Javascript and he's a bit traumatized by some concepts behind this language. It's also a new framework and it'll take more time.
+
+### Second round
+**Rémi** vote `L`, `XL` on previous round was mainly because no motivation to do this task.
+
+**Sylvan** vote `XL` by mimicking Yann's previsous vote.
+
+**Yann** vote `XL` Think for him it's an `XL` task
+
+### Third round
+All vote `XL`
+
+## Measure temperature (#12)
+Use connected sensor to measure a temperature
+
+### First round
+**Rémi** vote `M` because he never did on a RPI and it's always take a bit more time to do something new.
+
+**Sylvan** vote `S` because if it's sensor with a library, it should be easily done.
+
+**Yann** vote `M` because it's not a STM, but a PI, there is still a bit more new things to do.
+
+### Second round
+All vote `M`
+
+## Wifi (#13)
+Setup the connection on wifi so that the raspberry pi can send MQTT messages
+
+### First round
+**Rémi** vote `S` because he think it's easy but still have to configure with env variables for automatic setup by the program
+
+**Sylvan** vote `XS` because he think it's vers easy to do it mannually
+
+**Yann** vote `M` because he never did it and some doc to read to do it automatically and because new lib, it take time
+
+### Second round
+All vote `S`
+
+## Config CI/CD RPI (#17)
+Config CI workflow (on GitLab) for Raspberry Pi
+Config CD for Raspberry Pi
+
+### First round
+**Rémi** vote `L` because he partially already saw that, but as soon it's on hardware, something's gone to shit
+
+**Sylvan** vote `XL` because he never did CI/CD, it's a big unknown task. The difficulty of this task depends a lot of the course.
+
+**Yann** vote `L` because he see only a bit of CI last semester. For him difficulties is on CD.
+
+### Second round
+**Rémi** vote `L`, **Sylvan** vote `XL` and **Yann** vote `L`
+
+All won't change there vote, they are convice it's this level of difficulty.