Update documentation

README.md

@@ -4,16 +4,16 @@
 of ECFs for different astronomical X-ray missions. Currently 
 we include XMM-Newton/EPIC, Swift/XRT and eROSITA. ECFs where
 calculated consistently for the different missions using the most
-updated calibration files at the date of the package release of t
-version of the package.
+updated calibration files at the date of the package release.
 
 X-ray sources detected through photon counter cameras are characterized 
 by count-rates at a given energy band. These count-rates (CR) can be 
 converted into physical fluxes using the calibrated response of the
 detector and assuming an specific spectral model via:
 
-    FLUX = CR / ECF
-
+```math
+FLUX = CR / ECF
+```
 where the ECF (Energy Conversion Factor) encapsulate the information
 about the response and spectral model for the given energy band. 
 For an in-depth explanation of ECF and how they are calculated see
@@ -22,11 +22,23 @@ or the [eROSITA ECF tutorial](https://erosita.mpe.mpg.de/dr1/eSASS4DR1/eSASS4DR1
 
 Details about our ECF calculations for the different missions can 
 be found in the [corresponding Jupyter notebooks](https://github.com/ruizca/ecfxa/tree/main/calc) included 
-in this repository.
+in the `ecfxa` GitHub repository.
+
+
+Installation
+------------
+
+    > pip install ecfxa
+
 
 Examples
 --------
 
+    >>> import ecfxa
+    >>> ero_ecfs = ecfxa.eROSITA(eband="SOFT")
+    >>> ero_ecfs(nh=3e20, gamma=2.0)
+    <Quantity 1.18592291e+12 cm2 / erg>
+
 We provide a [Jupyter notebook with examples](https://github.com/ruizca/ecfxa/tree/main/docs/examples.ipynb) 
 on how to use `ecfxa` for different X-ray missions. Check the full 
 documentation [here](https://ruizca.github.io/ecfxa/ecfxa/ecfs.html).