readme updated

.gitignore

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-slock
-*.o
-config.h

README.md

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+# slock
+
+This is my patched version of slock. The base version is directly from suckless.org.
+
+## Installation
+
+The most basic way is to clone the repository and then invoke make.
+
+- `git clone https://github.com/tiyn/st-0.9.0`
+- `make clean install`