README.md updated. Added name of config file. To be thinked on how to implement configuration. There's only one option to store, but I want to come up with solution suitable to use in future.

README.md

@@ -1,13 +1,22 @@
 Keep track of your piggy bank.
 
-
 Every time you put coins in or take them out of your piggy bank, write here down
-how much did you put or take. So you won't have to spend time to count them when
+how much did you put or take. So you won't have to spend time counting them when
 you decide to take them all out.
 
 Yes, only coins, no banknots. Well, you actually can easily add support for
 banknots, but table will become indeed wide.
 
+# Backstory
+
+Many years ago I wrote a little script to store info on how much coins I have
+in my piggy bank. It used SQLite 3 database for it and was hardcoded to rubles.
+
+This year I came up with an idea that it would be good to learn on how to make
+packages for Python. And with no better ideas I took my piggy bank script to be
+rewritten to support any currency. Database was thrown away and its place was
+took by a simple text format.
+
 # Usage
 
 This is a CLI program that is broken down to three separate programs:
@@ -24,9 +33,11 @@ optionally, print a list of transactions.
 piggybank-* [(-h | --help) | (-v | --version) | --list-currencies]
 ```
 
-Those three flags are very self-explanatory. The first one will print the help.
-The second — version and license. And the last one will print all
-supported currencies. They are not combinable.
+`--help` to show help on what commands you can use.
+
+`--version` to show version of program.
+
+`--list-currencies` to show what currencies supported and which one is default.
 
 ## How to put coins in
 
@@ -37,28 +48,30 @@ piggybank-put <file> [-r | --reverse] <coins> [(-c | --currency) <currency>]
 Here's how to put coins in a piggybank file. It will also create a file if it
 doesn't exist.
 
-<file> is a name of a piggy bank file wich may not have a .pb extension at the
+`<file>` is a name of a piggy bank file wich may not have a .pb extension at the
 end, it will be added automatically.
 
-<coins> is a set of coins' counts separated with space character. For example:
+`<coins>` is a set of coins' counts separated with space character. For example:
 0 0 0 5 0 4 6 7. By default trailing zeroes will be added from the
 left. So if you wrote something like 6 0 5 12 then it will be complemented to
 0 0 0 0 6 0 5 12 if currency has 8 coins.
 
---reverse flag reverses the order of coins. By default they come from least
+`--reverse` flag reverses the order of coins. By default they come from least
 significant face value to the most significant one and as stated above being
 complemented from left so a set shorter than number of coins in a currency,
 e.g. 5 8 4 will be interpreted as 0 0 0 0 0 5 8 4. And this flag will make it
 to be interpreted as 5 8 4 0 0 0 0 0. It is convenient if you want to add only
 coins of low face value (e.g. cents or kopeks).
 
---currency parameter specifies the currency of a new piggy bank. It will not
+`--currency` parameter specifies the currency of a new piggy bank. It will not
 change currency of an existing piggy bank.
 
 ### Examples:
 
-    piggybank-put example.pb 7 4 3 0 5 -c euro
-    piggybank-put example -r 0 4 6
+```bash
+piggybank-put example.pb 7 4 3 0 5 -c euro
+piggybank-put example -r 0 4 6
+```
 
 ## How to take coins out
 
@@ -67,7 +80,7 @@ piggybank-take <file> [-r | --reverse] <coins>
 ```
 
 All the parameters are explained above. `--currency` flag is not applicable
-here. It just takes coins out rather putting them in.
+here.
 
 ### Examples:
 
@@ -77,10 +90,12 @@ piggybank-take example.pb -r 0 0 4
 
 ## How to see what do you have
 
-    piggybank-show <file> [-t | --transactions]
+```bash
+piggybank-show <file> [-t | --transactions]
+```
 
-Without -t flag only summarised information will be printed. --transactions flag
-tells the program to print out all the transactions stored in a piggy bank.
+Without `-t` flag only summarised information will be printed. `--transactions`
+flag tells the program to print out all the transactions stored in a piggy bank.
 
 ### Examples:
 

piggybank/__init__.py

@@ -12,6 +12,7 @@ http://www.wtfpl.net/ for more details."""
 
 
 PIGGYBANK_FILE_EXTENSION = ".pb"
+PIGGYBANK_CONFIGURATION_FILE = "piggybank.conf"
 
 
 def print_program_version() -> None: