Add readme

README.md

+# Data analysis repo
+
+This repository is a collection of data analysis repos for various shifts and contains the common code for reading and evaluating data.
+
+## Usage
+
+### Clone
+```
+git clone git@git.gsi.de:p.niedermayer/data-analysis.git
+cd data-analysis
+git submodule init
+git -c http.sslVerify=false submodule update common/bdiolib
+```
+Then, for every data analysis submodule (folder name xxxx) of interest
+```
+git submodule update xxxx
+```
+
+
+
+
+### Add new data analysis repo
+
+- Create git repo
+- Add a README to it and initial commit
+- Add submodule locally
+  ```
+  git submodule add git@git.gsi.de:p.niedermayer/data-analysis-xxxx.git xxxx
+  git commit -m "Added submodule xxxx"
+  ```
+
+