Implement Spache Readability Scorer #5

Author: Carmine DiMascio

CONTRIBUTING.md

@@ -7,6 +7,14 @@
 
 Need help? Reach out on [gitter](https://gitter.im/cdimascio-oss/community)
 
+### Prequisites
+
+1. Install deps
+```
+pip install .
+python -m nltk.downloader punkt
+```
+
 ### Code
 
 1. Fork the repo

README.md

@@ -34,6 +34,7 @@ r.dale_chall()
 r.ari()
 r.linsear_write()
 r.smog()
+r.spache()
 ```
 
 **\*Note:** `text` must contain >= 100 words\*
@@ -47,6 +48,7 @@ r.smog()
 - [Coleman Liau Index](#coleman-liau-index)
 - [Gunning Fog](#gunning-fog)
 - [SMOG](#smog)
+- [Spache](#spache)
 - [Linsear Write](#linsear-write)
 
 ## Readability Metric Details and Properties
@@ -187,6 +189,22 @@ print(s.score)
 print(s.grade_level)
 ```
 
+The Spache Readability Formula is used for Primary-Grade Reading Materials, published in 1953 in The Elementary School Journal. The Spache Formula is best used to calculate the difficulty of text that falls at the 3rd grade level or below. 
+
+**_call:_**
+
+```python
+r.spache()
+```
+
+**_example:_**
+
+```python
+s = r.spache()
+print(s.score)
+print(s.grade_level)
+```
+
 ### Linsear Write
 
 Linsear Write is a readability metric for English text, purportedly developed for the United States Air Force to help them calculate the readability of their technical manuals.