added README.md

Author: junghans

README.md

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+#Scripts for scientific purposes
+
+* `avg`: calculates the average of a series of numbers
+* `avg2`: like `avg` but print fluctuation instead of standard error
+* `avg_bl`: like `avg`, but using blocks to calculate error
+* `avg_bs`: like `avg`, but using bootstraping technique to calculate error
+* `avg_jk`: like `avg`, but using jackknife method to calculate error
+* `cross_corr`: calculates the cross correlation function of a series of numbers
+* `csa`: Christoph's simple analysis
+* `gauss_chain`: generates a grauss chain with a certain correlation
+* `histogram`: calculates a histogram out of a series of numbers
+* `histogram2d`: calculates a 2d histogram out of a series of numbers
+* `max`: calculates the max of a series of numbers
+* `min`: calculates the min of a series of numbers
+* `ravg`: calculates the running average of a series of numbers 
+
+##Issues
+
+Report bugs on the [github issues site](https://github.com/junghans/sci-scripts/issues)
+